diff --git a/app/Http/Controllers/Api/V1/SiteController.php b/app/Http/Controllers/Api/V1/SiteController.php
new file mode 100644
index 0000000..29e5775
--- /dev/null
+++ b/app/Http/Controllers/Api/V1/SiteController.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\V1\Site\StoreSiteRequest;
+use App\Http\Requests\V1\Site\UpdateSiteRequest;
+use App\Http\Responses\ApiResponse;
+use App\Services\SiteService;
+use Illuminate\Http\Request;
+
+class SiteController extends Controller
+{
+    public function __construct(
+        private readonly SiteService $service
+    ) {}
+
+    /**
+     * 현장 목록
+     */
+    public function index(Request $request)
+    {
+        $params = $request->only([
+            'search',
+            'is_active',
+            'sort_by',
+            'sort_dir',
+            'per_page',
+            'page',
+        ]);
+
+        $sites = $this->service->index($params);
+
+        return ApiResponse::handle(__('message.fetched'), $sites);
+    }
+
+    /**
+     * 현장 등록
+     */
+    public function store(StoreSiteRequest $request)
+    {
+        $site = $this->service->store($request->validated());
+
+        return ApiResponse::handle(__('message.created'), $site, 201);
+    }
+
+    /**
+     * 현장 상세
+     */
+    public function show(int $id)
+    {
+        $site = $this->service->show($id);
+
+        return ApiResponse::handle(__('message.fetched'), $site);
+    }
+
+    /**
+     * 현장 수정
+     */
+    public function update(int $id, UpdateSiteRequest $request)
+    {
+        $site = $this->service->update($id, $request->validated());
+
+        return ApiResponse::handle(__('message.updated'), $site);
+    }
+
+    /**
+     * 현장 삭제
+     */
+    public function destroy(int $id)
+    {
+        $this->service->destroy($id);
+
+        return ApiResponse::handle(__('message.deleted'));
+    }
+
+    /**
+     * 활성화된 현장 목록 (셀렉트박스용)
+     */
+    public function active()
+    {
+        $sites = $this->service->getActiveSites();
+
+        return ApiResponse::handle(__('message.fetched'), $sites);
+    }
+}
diff --git a/app/Http/Controllers/Api/V1/WorkSettingController.php b/app/Http/Controllers/Api/V1/WorkSettingController.php
new file mode 100644
index 0000000..78b86c4
--- /dev/null
+++ b/app/Http/Controllers/Api/V1/WorkSettingController.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\V1\WorkSetting\UpdateAttendanceSettingRequest;
+use App\Http\Requests\V1\WorkSetting\UpdateWorkSettingRequest;
+use App\Http\Responses\ApiResponse;
+use App\Services\WorkSettingService;
+
+class WorkSettingController extends Controller
+{
+    public function __construct(
+        private readonly WorkSettingService $service
+    ) {}
+
+    /**
+     * 근무 설정 조회
+     */
+    public function showWorkSetting()
+    {
+        $setting = $this->service->getWorkSetting();
+
+        return ApiResponse::handle(__('message.fetched'), $setting);
+    }
+
+    /**
+     * 근무 설정 수정
+     */
+    public function updateWorkSetting(UpdateWorkSettingRequest $request)
+    {
+        $setting = $this->service->updateWorkSetting($request->validated());
+
+        return ApiResponse::handle(__('message.updated'), $setting);
+    }
+
+    /**
+     * 출퇴근 설정 조회
+     */
+    public function showAttendanceSetting()
+    {
+        $setting = $this->service->getAttendanceSetting();
+
+        return ApiResponse::handle(__('message.fetched'), $setting);
+    }
+
+    /**
+     * 출퇴근 설정 수정
+     */
+    public function updateAttendanceSetting(UpdateAttendanceSettingRequest $request)
+    {
+        $setting = $this->service->updateAttendanceSetting($request->validated());
+
+        return ApiResponse::handle(__('message.updated'), $setting);
+    }
+}
diff --git a/app/Http/Requests/V1/Site/StoreSiteRequest.php b/app/Http/Requests/V1/Site/StoreSiteRequest.php
new file mode 100644
index 0000000..2d51326
--- /dev/null
+++ b/app/Http/Requests/V1/Site/StoreSiteRequest.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Http\Requests\V1\Site;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreSiteRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:100'],
+            'address' => ['nullable', 'string', 'max:255'],
+            'latitude' => ['nullable', 'numeric', 'between:-90,90'],
+            'longitude' => ['nullable', 'numeric', 'between:-180,180'],
+            'is_active' => ['sometimes', 'boolean'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'name.required' => __('error.site.name_required'),
+            'name.max' => __('error.site.name_too_long'),
+            'latitude.between' => __('error.site.invalid_latitude'),
+            'longitude.between' => __('error.site.invalid_longitude'),
+        ];
+    }
+}
diff --git a/app/Http/Requests/V1/Site/UpdateSiteRequest.php b/app/Http/Requests/V1/Site/UpdateSiteRequest.php
new file mode 100644
index 0000000..91b6196
--- /dev/null
+++ b/app/Http/Requests/V1/Site/UpdateSiteRequest.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Http\Requests\V1\Site;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateSiteRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'name' => ['sometimes', 'string', 'max:100'],
+            'address' => ['nullable', 'string', 'max:255'],
+            'latitude' => ['nullable', 'numeric', 'between:-90,90'],
+            'longitude' => ['nullable', 'numeric', 'between:-180,180'],
+            'is_active' => ['sometimes', 'boolean'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'name.max' => __('error.site.name_too_long'),
+            'latitude.between' => __('error.site.invalid_latitude'),
+            'longitude.between' => __('error.site.invalid_longitude'),
+        ];
+    }
+}
diff --git a/app/Http/Requests/V1/WorkSetting/UpdateAttendanceSettingRequest.php b/app/Http/Requests/V1/WorkSetting/UpdateAttendanceSettingRequest.php
new file mode 100644
index 0000000..25e323e
--- /dev/null
+++ b/app/Http/Requests/V1/WorkSetting/UpdateAttendanceSettingRequest.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Http\Requests\V1\WorkSetting;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdateAttendanceSettingRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'use_gps' => ['sometimes', 'boolean'],
+            'allowed_radius' => ['sometimes', 'integer', 'min:10', 'max:10000'],
+            'hq_address' => ['nullable', 'string', 'max:255'],
+            'hq_latitude' => ['nullable', 'numeric', 'between:-90,90'],
+            'hq_longitude' => ['nullable', 'numeric', 'between:-180,180'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'allowed_radius.min' => __('error.attendance_setting.radius_too_small'),
+            'allowed_radius.max' => __('error.attendance_setting.radius_too_large'),
+            'hq_latitude.between' => __('error.attendance_setting.invalid_latitude'),
+            'hq_longitude.between' => __('error.attendance_setting.invalid_longitude'),
+        ];
+    }
+}
diff --git a/app/Http/Requests/V1/WorkSetting/UpdateWorkSettingRequest.php b/app/Http/Requests/V1/WorkSetting/UpdateWorkSettingRequest.php
new file mode 100644
index 0000000..bcb9008
--- /dev/null
+++ b/app/Http/Requests/V1/WorkSetting/UpdateWorkSettingRequest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Http\Requests\V1\WorkSetting;
+
+use App\Models\Tenants\WorkSetting;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateWorkSettingRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'work_type' => ['sometimes', 'string', Rule::in(WorkSetting::WORK_TYPES)],
+            'standard_hours' => ['sometimes', 'integer', 'min:1', 'max:168'],
+            'overtime_hours' => ['sometimes', 'integer', 'min:0', 'max:52'],
+            'overtime_limit' => ['sometimes', 'integer', 'min:0', 'max:100'],
+            'work_days' => ['sometimes', 'array'],
+            'work_days.*' => ['string', Rule::in(['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'])],
+            'start_time' => ['sometimes', 'date_format:H:i:s'],
+            'end_time' => ['sometimes', 'date_format:H:i:s', 'after:start_time'],
+            'break_minutes' => ['sometimes', 'integer', 'min:0', 'max:180'],
+            'break_start' => ['nullable', 'date_format:H:i:s'],
+            'break_end' => ['nullable', 'date_format:H:i:s', 'after:break_start'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'work_type.in' => __('error.work_setting.invalid_work_type'),
+            'end_time.after' => __('error.work_setting.end_time_after_start'),
+            'break_end.after' => __('error.work_setting.break_end_after_start'),
+        ];
+    }
+}
diff --git a/app/Models/Tenants/AttendanceSetting.php b/app/Models/Tenants/AttendanceSetting.php
new file mode 100644
index 0000000..c7f3eda
--- /dev/null
+++ b/app/Models/Tenants/AttendanceSetting.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace App\Models\Tenants;
+
+use App\Traits\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * 출퇴근 설정 모델
+ *
+ * @property int $id
+ * @property int $tenant_id
+ * @property bool $use_gps
+ * @property int $allowed_radius
+ * @property string|null $hq_address
+ * @property float|null $hq_latitude
+ * @property float|null $hq_longitude
+ */
+class AttendanceSetting extends Model
+{
+    use BelongsToTenant;
+
+    protected $table = 'attendance_settings';
+
+    protected $fillable = [
+        'tenant_id',
+        'use_gps',
+        'allowed_radius',
+        'hq_address',
+        'hq_latitude',
+        'hq_longitude',
+    ];
+
+    protected $casts = [
+        'use_gps' => 'boolean',
+        'allowed_radius' => 'integer',
+        'hq_latitude' => 'decimal:8',
+        'hq_longitude' => 'decimal:8',
+    ];
+
+    protected $attributes = [
+        'use_gps' => false,
+        'allowed_radius' => 100,
+    ];
+
+    // =========================================================================
+    // 헬퍼 메서드
+    // =========================================================================
+
+    /**
+     * GPS 설정 완료 여부
+     */
+    public function isGpsConfigured(): bool
+    {
+        return $this->use_gps
+            && $this->hq_latitude !== null
+            && $this->hq_longitude !== null;
+    }
+
+    /**
+     * 좌표가 허용 범위 내인지 확인
+     */
+    public function isWithinRadius(float $latitude, float $longitude): bool
+    {
+        if (! $this->isGpsConfigured()) {
+            return true; // GPS 미설정 시 항상 허용
+        }
+
+        $distance = $this->calculateDistance(
+            $this->hq_latitude,
+            $this->hq_longitude,
+            $latitude,
+            $longitude
+        );
+
+        return $distance <= $this->allowed_radius;
+    }
+
+    /**
+     * 두 좌표 간 거리 계산 (미터)
+     * Haversine 공식 사용
+     */
+    private function calculateDistance(float $lat1, float $lon1, float $lat2, float $lon2): float
+    {
+        $earthRadius = 6371000; // 지구 반경 (미터)
+
+        $lat1Rad = deg2rad($lat1);
+        $lat2Rad = deg2rad($lat2);
+        $deltaLat = deg2rad($lat2 - $lat1);
+        $deltaLon = deg2rad($lon2 - $lon1);
+
+        $a = sin($deltaLat / 2) * sin($deltaLat / 2) +
+            cos($lat1Rad) * cos($lat2Rad) *
+            sin($deltaLon / 2) * sin($deltaLon / 2);
+
+        $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
+
+        return $earthRadius * $c;
+    }
+}
diff --git a/app/Models/Tenants/Site.php b/app/Models/Tenants/Site.php
new file mode 100644
index 0000000..cfd216b
--- /dev/null
+++ b/app/Models/Tenants/Site.php
@@ -0,0 +1,125 @@
+<?php
+
+namespace App\Models\Tenants;
+
+use App\Models\Members\User;
+use App\Traits\BelongsToTenant;
+use App\Traits\ModelTrait;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+/**
+ * 현장 모델
+ *
+ * @property int $id
+ * @property int $tenant_id
+ * @property string $name
+ * @property string|null $address
+ * @property float|null $latitude
+ * @property float|null $longitude
+ * @property bool $is_active
+ * @property int|null $created_by
+ * @property int|null $updated_by
+ * @property int|null $deleted_by
+ */
+class Site extends Model
+{
+    use BelongsToTenant, ModelTrait, SoftDeletes;
+
+    protected $table = 'sites';
+
+    protected $fillable = [
+        'tenant_id',
+        'name',
+        'address',
+        'latitude',
+        'longitude',
+        'is_active',
+        'created_by',
+        'updated_by',
+        'deleted_by',
+    ];
+
+    protected $casts = [
+        'latitude' => 'decimal:8',
+        'longitude' => 'decimal:8',
+        'is_active' => 'boolean',
+    ];
+
+    protected $attributes = [
+        'is_active' => true,
+    ];
+
+    // =========================================================================
+    // 관계 정의
+    // =========================================================================
+
+    /**
+     * 생성자
+     */
+    public function creator(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'created_by');
+    }
+
+    /**
+     * 수정자
+     */
+    public function updater(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'updated_by');
+    }
+
+    // =========================================================================
+    // 헬퍼 메서드
+    // =========================================================================
+
+    /**
+     * GPS 좌표 설정 여부
+     */
+    public function hasCoordinates(): bool
+    {
+        return $this->latitude !== null && $this->longitude !== null;
+    }
+
+    /**
+     * 좌표가 허용 범위 내인지 확인
+     */
+    public function isWithinRadius(float $latitude, float $longitude, int $radiusMeters = 100): bool
+    {
+        if (! $this->hasCoordinates()) {
+            return true; // 좌표 미설정 시 항상 허용
+        }
+
+        $distance = $this->calculateDistance(
+            $this->latitude,
+            $this->longitude,
+            $latitude,
+            $longitude
+        );
+
+        return $distance <= $radiusMeters;
+    }
+
+    /**
+     * 두 좌표 간 거리 계산 (미터)
+     */
+    private function calculateDistance(float $lat1, float $lon1, float $lat2, float $lon2): float
+    {
+        $earthRadius = 6371000;
+
+        $lat1Rad = deg2rad($lat1);
+        $lat2Rad = deg2rad($lat2);
+        $deltaLat = deg2rad($lat2 - $lat1);
+        $deltaLon = deg2rad($lon2 - $lon1);
+
+        $a = sin($deltaLat / 2) * sin($deltaLat / 2) +
+            cos($lat1Rad) * cos($lat2Rad) *
+            sin($deltaLon / 2) * sin($deltaLon / 2);
+
+        $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
+
+        return $earthRadius * $c;
+    }
+}
diff --git a/app/Models/Tenants/WorkSetting.php b/app/Models/Tenants/WorkSetting.php
new file mode 100644
index 0000000..5776968
--- /dev/null
+++ b/app/Models/Tenants/WorkSetting.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace App\Models\Tenants;
+
+use App\Traits\BelongsToTenant;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * 근무 설정 모델
+ *
+ * @property int $id
+ * @property int $tenant_id
+ * @property string $work_type
+ * @property int $standard_hours
+ * @property int $overtime_hours
+ * @property int $overtime_limit
+ * @property array|null $work_days
+ * @property string $start_time
+ * @property string $end_time
+ * @property int $break_minutes
+ * @property string|null $break_start
+ * @property string|null $break_end
+ */
+class WorkSetting extends Model
+{
+    use BelongsToTenant;
+
+    protected $table = 'work_settings';
+
+    protected $fillable = [
+        'tenant_id',
+        'work_type',
+        'standard_hours',
+        'overtime_hours',
+        'overtime_limit',
+        'work_days',
+        'start_time',
+        'end_time',
+        'break_minutes',
+        'break_start',
+        'break_end',
+    ];
+
+    protected $casts = [
+        'work_days' => 'array',
+        'standard_hours' => 'integer',
+        'overtime_hours' => 'integer',
+        'overtime_limit' => 'integer',
+        'break_minutes' => 'integer',
+    ];
+
+    protected $attributes = [
+        'work_type' => 'fixed',
+        'standard_hours' => 40,
+        'overtime_hours' => 12,
+        'overtime_limit' => 52,
+        'start_time' => '09:00:00',
+        'end_time' => '18:00:00',
+        'break_minutes' => 60,
+        'break_start' => '12:00:00',
+        'break_end' => '13:00:00',
+    ];
+
+    // =========================================================================
+    // 상수 정의
+    // =========================================================================
+
+    public const TYPE_FIXED = 'fixed';         // 고정 근무
+
+    public const TYPE_FLEXIBLE = 'flexible';   // 유연 근무
+
+    public const TYPE_CUSTOM = 'custom';       // 커스텀 근무
+
+    public const WORK_TYPES = [
+        self::TYPE_FIXED,
+        self::TYPE_FLEXIBLE,
+        self::TYPE_CUSTOM,
+    ];
+
+    public const DEFAULT_WORK_DAYS = ['mon', 'tue', 'wed', 'thu', 'fri'];
+
+    // =========================================================================
+    // 헬퍼 메서드
+    // =========================================================================
+
+    /**
+     * 근무 유형 라벨
+     */
+    public function getWorkTypeLabelAttribute(): string
+    {
+        return match ($this->work_type) {
+            self::TYPE_FIXED => '고정근무',
+            self::TYPE_FLEXIBLE => '유연근무',
+            self::TYPE_CUSTOM => '커스텀',
+            default => $this->work_type,
+        };
+    }
+
+    /**
+     * 일일 근무시간 계산 (분)
+     */
+    public function getDailyWorkMinutesAttribute(): int
+    {
+        $start = strtotime($this->start_time);
+        $end = strtotime($this->end_time);
+        $totalMinutes = ($end - $start) / 60;
+
+        return (int) ($totalMinutes - $this->break_minutes);
+    }
+}
diff --git a/app/Services/SiteService.php b/app/Services/SiteService.php
new file mode 100644
index 0000000..545eeff
--- /dev/null
+++ b/app/Services/SiteService.php
@@ -0,0 +1,145 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\Tenants\Site;
+use Illuminate\Contracts\Pagination\LengthAwarePaginator;
+use Illuminate\Support\Facades\DB;
+
+class SiteService extends Service
+{
+    /**
+     * 현장 목록 조회
+     */
+    public function index(array $params): LengthAwarePaginator
+    {
+        $tenantId = $this->tenantId();
+
+        $query = Site::query()
+            ->where('tenant_id', $tenantId);
+
+        // 검색 필터
+        if (! empty($params['search'])) {
+            $search = $params['search'];
+            $query->where(function ($q) use ($search) {
+                $q->where('name', 'like', "%{$search}%")
+                    ->orWhere('address', 'like', "%{$search}%");
+            });
+        }
+
+        // 활성화 상태 필터
+        if (isset($params['is_active'])) {
+            $query->where('is_active', $params['is_active']);
+        }
+
+        // 정렬
+        $sortBy = $params['sort_by'] ?? 'created_at';
+        $sortDir = $params['sort_dir'] ?? 'desc';
+        $query->orderBy($sortBy, $sortDir);
+
+        // 페이지네이션
+        $perPage = $params['per_page'] ?? 20;
+
+        return $query->paginate($perPage);
+    }
+
+    /**
+     * 현장 상세 조회
+     */
+    public function show(int $id): Site
+    {
+        $tenantId = $this->tenantId();
+
+        return Site::query()
+            ->where('tenant_id', $tenantId)
+            ->findOrFail($id);
+    }
+
+    /**
+     * 현장 등록
+     */
+    public function store(array $data): Site
+    {
+        $tenantId = $this->tenantId();
+        $userId = $this->apiUserId();
+
+        return DB::transaction(function () use ($data, $tenantId, $userId) {
+            $site = Site::create([
+                'tenant_id' => $tenantId,
+                'name' => $data['name'],
+                'address' => $data['address'] ?? null,
+                'latitude' => $data['latitude'] ?? null,
+                'longitude' => $data['longitude'] ?? null,
+                'is_active' => $data['is_active'] ?? true,
+                'created_by' => $userId,
+                'updated_by' => $userId,
+            ]);
+
+            return $site;
+        });
+    }
+
+    /**
+     * 현장 수정
+     */
+    public function update(int $id, array $data): Site
+    {
+        $tenantId = $this->tenantId();
+        $userId = $this->apiUserId();
+
+        return DB::transaction(function () use ($id, $data, $tenantId, $userId) {
+            $site = Site::query()
+                ->where('tenant_id', $tenantId)
+                ->findOrFail($id);
+
+            $site->fill([
+                'name' => $data['name'] ?? $site->name,
+                'address' => $data['address'] ?? $site->address,
+                'latitude' => $data['latitude'] ?? $site->latitude,
+                'longitude' => $data['longitude'] ?? $site->longitude,
+                'is_active' => $data['is_active'] ?? $site->is_active,
+                'updated_by' => $userId,
+            ]);
+
+            $site->save();
+
+            return $site->fresh();
+        });
+    }
+
+    /**
+     * 현장 삭제
+     */
+    public function destroy(int $id): bool
+    {
+        $tenantId = $this->tenantId();
+        $userId = $this->apiUserId();
+
+        return DB::transaction(function () use ($id, $tenantId, $userId) {
+            $site = Site::query()
+                ->where('tenant_id', $tenantId)
+                ->findOrFail($id);
+
+            $site->deleted_by = $userId;
+            $site->save();
+            $site->delete();
+
+            return true;
+        });
+    }
+
+    /**
+     * 활성화된 현장 목록 조회 (셀렉트박스용)
+     */
+    public function getActiveSites(): array
+    {
+        $tenantId = $this->tenantId();
+
+        return Site::query()
+            ->where('tenant_id', $tenantId)
+            ->where('is_active', true)
+            ->orderBy('name')
+            ->get(['id', 'name', 'address'])
+            ->toArray();
+    }
+}
diff --git a/app/Services/WorkSettingService.php b/app/Services/WorkSettingService.php
new file mode 100644
index 0000000..6a215f1
--- /dev/null
+++ b/app/Services/WorkSettingService.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\Tenants\AttendanceSetting;
+use App\Models\Tenants\WorkSetting;
+
+class WorkSettingService extends Service
+{
+    /**
+     * 근무 설정 조회 (없으면 생성)
+     */
+    public function getWorkSetting(): WorkSetting
+    {
+        $tenantId = $this->tenantId();
+
+        $setting = WorkSetting::query()
+            ->where('tenant_id', $tenantId)
+            ->first();
+
+        if (! $setting) {
+            $setting = WorkSetting::create([
+                'tenant_id' => $tenantId,
+                'work_days' => WorkSetting::DEFAULT_WORK_DAYS,
+            ]);
+        }
+
+        return $setting;
+    }
+
+    /**
+     * 근무 설정 수정
+     */
+    public function updateWorkSetting(array $data): WorkSetting
+    {
+        $tenantId = $this->tenantId();
+
+        $setting = WorkSetting::query()
+            ->where('tenant_id', $tenantId)
+            ->first();
+
+        if (! $setting) {
+            $setting = new WorkSetting(['tenant_id' => $tenantId]);
+        }
+
+        $setting->fill($data);
+        $setting->save();
+
+        return $setting->fresh();
+    }
+
+    /**
+     * 출퇴근 설정 조회 (없으면 생성)
+     */
+    public function getAttendanceSetting(): AttendanceSetting
+    {
+        $tenantId = $this->tenantId();
+
+        $setting = AttendanceSetting::query()
+            ->where('tenant_id', $tenantId)
+            ->first();
+
+        if (! $setting) {
+            $setting = AttendanceSetting::create([
+                'tenant_id' => $tenantId,
+            ]);
+        }
+
+        return $setting;
+    }
+
+    /**
+     * 출퇴근 설정 수정
+     */
+    public function updateAttendanceSetting(array $data): AttendanceSetting
+    {
+        $tenantId = $this->tenantId();
+
+        $setting = AttendanceSetting::query()
+            ->where('tenant_id', $tenantId)
+            ->first();
+
+        if (! $setting) {
+            $setting = new AttendanceSetting(['tenant_id' => $tenantId]);
+        }
+
+        $setting->fill($data);
+        $setting->save();
+
+        return $setting->fresh();
+    }
+}
diff --git a/app/Swagger/v1/SiteApi.php b/app/Swagger/v1/SiteApi.php
new file mode 100644
index 0000000..48360dd
--- /dev/null
+++ b/app/Swagger/v1/SiteApi.php
@@ -0,0 +1,270 @@
+<?php
+
+namespace App\Swagger\v1;
+
+/**
+ * @OA\Tag(name="Sites", description="현장 관리")
+ *
+ * @OA\Schema(
+ *     schema="Site",
+ *     type="object",
+ *     description="현장 정보",
+ *
+ *     @OA\Property(property="id", type="integer", example=1, description="현장 ID"),
+ *     @OA\Property(property="tenant_id", type="integer", example=1, description="테넌트 ID"),
+ *     @OA\Property(property="name", type="string", example="강남 현장", description="현장명"),
+ *     @OA\Property(property="address", type="string", example="서울시 강남구 테헤란로 123", nullable=true, description="현장 주소"),
+ *     @OA\Property(property="latitude", type="number", format="float", example=37.5012, nullable=true, description="위도"),
+ *     @OA\Property(property="longitude", type="number", format="float", example=127.0396, nullable=true, description="경도"),
+ *     @OA\Property(property="is_active", type="boolean", example=true, description="활성화 여부"),
+ *     @OA\Property(property="created_by", type="integer", example=1, nullable=true, description="생성자 ID"),
+ *     @OA\Property(property="updated_by", type="integer", example=1, nullable=true, description="수정자 ID"),
+ *     @OA\Property(property="created_at", type="string", format="date-time"),
+ *     @OA\Property(property="updated_at", type="string", format="date-time")
+ * )
+ *
+ * @OA\Schema(
+ *     schema="SiteCreateRequest",
+ *     type="object",
+ *     required={"name"},
+ *     description="현장 등록 요청",
+ *
+ *     @OA\Property(property="name", type="string", example="강남 현장", maxLength=100, description="현장명"),
+ *     @OA\Property(property="address", type="string", example="서울시 강남구 테헤란로 123", maxLength=255, description="현장 주소"),
+ *     @OA\Property(property="latitude", type="number", format="float", example=37.5012, minimum=-90, maximum=90, description="위도"),
+ *     @OA\Property(property="longitude", type="number", format="float", example=127.0396, minimum=-180, maximum=180, description="경도"),
+ *     @OA\Property(property="is_active", type="boolean", example=true, description="활성화 여부")
+ * )
+ *
+ * @OA\Schema(
+ *     schema="SiteUpdateRequest",
+ *     type="object",
+ *     description="현장 수정 요청",
+ *
+ *     @OA\Property(property="name", type="string", example="강남 현장", maxLength=100, description="현장명"),
+ *     @OA\Property(property="address", type="string", example="서울시 강남구 테헤란로 123", maxLength=255, description="현장 주소"),
+ *     @OA\Property(property="latitude", type="number", format="float", example=37.5012, minimum=-90, maximum=90, description="위도"),
+ *     @OA\Property(property="longitude", type="number", format="float", example=127.0396, minimum=-180, maximum=180, description="경도"),
+ *     @OA\Property(property="is_active", type="boolean", example=true, description="활성화 여부")
+ * )
+ *
+ * @OA\Schema(
+ *     schema="SiteListItem",
+ *     type="object",
+ *     description="현장 목록 아이템 (셀렉트박스용)",
+ *
+ *     @OA\Property(property="id", type="integer", example=1, description="현장 ID"),
+ *     @OA\Property(property="name", type="string", example="강남 현장", description="현장명"),
+ *     @OA\Property(property="address", type="string", example="서울시 강남구", nullable=true, description="현장 주소")
+ * )
+ */
+class SiteApi
+{
+    /**
+     * @OA\Get(
+     *     path="/api/v1/sites",
+     *     tags={"Sites"},
+     *     summary="현장 목록 조회",
+     *     description="현장 목록을 조회합니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\Parameter(name="search", in="query", description="검색어 (현장명, 주소)", @OA\Schema(type="string")),
+     *     @OA\Parameter(name="is_active", in="query", description="활성화 상태 필터", @OA\Schema(type="boolean")),
+     *     @OA\Parameter(name="sort_by", in="query", description="정렬 기준", @OA\Schema(type="string", enum={"name","created_at"}, default="created_at")),
+     *     @OA\Parameter(name="sort_dir", in="query", description="정렬 방향", @OA\Schema(type="string", enum={"asc","desc"}, default="desc")),
+     *     @OA\Parameter(ref="#/components/parameters/Page"),
+     *     @OA\Parameter(ref="#/components/parameters/Size"),
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="조회 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(
+     *                         property="data",
+     *                         type="object",
+     *                         @OA\Property(property="current_page", type="integer", example=1),
+     *                         @OA\Property(property="data", type="array", @OA\Items(ref="#/components/schemas/Site")),
+     *                         @OA\Property(property="per_page", type="integer", example=20),
+     *                         @OA\Property(property="total", type="integer", example=10)
+     *                     )
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function index() {}
+
+    /**
+     * @OA\Post(
+     *     path="/api/v1/sites",
+     *     tags={"Sites"},
+     *     summary="현장 등록",
+     *     description="새로운 현장을 등록합니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\RequestBody(
+     *         required=true,
+     *
+     *         @OA\JsonContent(ref="#/components/schemas/SiteCreateRequest")
+     *     ),
+     *
+     *     @OA\Response(
+     *         response=201,
+     *         description="등록 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", ref="#/components/schemas/Site")
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=400, description="잘못된 요청", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function store() {}
+
+    /**
+     * @OA\Get(
+     *     path="/api/v1/sites/active",
+     *     tags={"Sites"},
+     *     summary="활성화된 현장 목록 (셀렉트박스용)",
+     *     description="활성화된 현장 목록을 간단한 형태로 조회합니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="조회 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", type="array", @OA\Items(ref="#/components/schemas/SiteListItem"))
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function active() {}
+
+    /**
+     * @OA\Get(
+     *     path="/api/v1/sites/{id}",
+     *     tags={"Sites"},
+     *     summary="현장 상세 조회",
+     *     description="현장 상세 정보를 조회합니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\Parameter(name="id", in="path", required=true, description="현장 ID", @OA\Schema(type="integer")),
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="조회 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", ref="#/components/schemas/Site")
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=404, description="현장 없음", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function show() {}
+
+    /**
+     * @OA\Put(
+     *     path="/api/v1/sites/{id}",
+     *     tags={"Sites"},
+     *     summary="현장 수정",
+     *     description="현장 정보를 수정합니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\Parameter(name="id", in="path", required=true, description="현장 ID", @OA\Schema(type="integer")),
+     *
+     *     @OA\RequestBody(
+     *         required=true,
+     *
+     *         @OA\JsonContent(ref="#/components/schemas/SiteUpdateRequest")
+     *     ),
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="수정 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", ref="#/components/schemas/Site")
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=400, description="잘못된 요청", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=404, description="현장 없음", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function update() {}
+
+    /**
+     * @OA\Delete(
+     *     path="/api/v1/sites/{id}",
+     *     tags={"Sites"},
+     *     summary="현장 삭제",
+     *     description="현장을 삭제합니다. (Soft Delete)",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\Parameter(name="id", in="path", required=true, description="현장 ID", @OA\Schema(type="integer")),
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="삭제 성공",
+     *
+     *         @OA\JsonContent(ref="#/components/schemas/ApiResponse")
+     *     ),
+     *
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=404, description="현장 없음", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function destroy() {}
+}
diff --git a/app/Swagger/v1/WorkSettingApi.php b/app/Swagger/v1/WorkSettingApi.php
new file mode 100644
index 0000000..4c5ff06
--- /dev/null
+++ b/app/Swagger/v1/WorkSettingApi.php
@@ -0,0 +1,209 @@
+<?php
+
+namespace App\Swagger\v1;
+
+/**
+ * @OA\Tag(name="WorkSettings", description="근무/출퇴근 설정")
+ *
+ * @OA\Schema(
+ *     schema="WorkSetting",
+ *     type="object",
+ *     description="근무 설정 정보",
+ *
+ *     @OA\Property(property="id", type="integer", example=1, description="ID"),
+ *     @OA\Property(property="tenant_id", type="integer", example=1, description="테넌트 ID"),
+ *     @OA\Property(property="work_type", type="string", enum={"fixed","flexible","custom"}, example="fixed", description="근무유형"),
+ *     @OA\Property(property="standard_hours", type="integer", example=40, description="주당 소정근로시간"),
+ *     @OA\Property(property="overtime_hours", type="integer", example=12, description="주당 연장근로시간"),
+ *     @OA\Property(property="overtime_limit", type="integer", example=52, description="연장근로한도"),
+ *     @OA\Property(property="work_days", type="array", @OA\Items(type="string"), example={"mon","tue","wed","thu","fri"}, description="근무요일"),
+ *     @OA\Property(property="start_time", type="string", format="time", example="09:00:00", description="출근시간"),
+ *     @OA\Property(property="end_time", type="string", format="time", example="18:00:00", description="퇴근시간"),
+ *     @OA\Property(property="break_minutes", type="integer", example=60, description="휴게시간(분)"),
+ *     @OA\Property(property="break_start", type="string", format="time", example="12:00:00", nullable=true, description="휴게시작"),
+ *     @OA\Property(property="break_end", type="string", format="time", example="13:00:00", nullable=true, description="휴게종료"),
+ *     @OA\Property(property="created_at", type="string", format="date-time"),
+ *     @OA\Property(property="updated_at", type="string", format="date-time")
+ * )
+ *
+ * @OA\Schema(
+ *     schema="WorkSettingUpdateRequest",
+ *     type="object",
+ *     description="근무 설정 수정 요청",
+ *
+ *     @OA\Property(property="work_type", type="string", enum={"fixed","flexible","custom"}, example="fixed", description="근무유형"),
+ *     @OA\Property(property="standard_hours", type="integer", example=40, minimum=1, maximum=168, description="주당 소정근로시간"),
+ *     @OA\Property(property="overtime_hours", type="integer", example=12, minimum=0, maximum=52, description="주당 연장근로시간"),
+ *     @OA\Property(property="overtime_limit", type="integer", example=52, minimum=0, maximum=100, description="연장근로한도"),
+ *     @OA\Property(property="work_days", type="array", @OA\Items(type="string", enum={"mon","tue","wed","thu","fri","sat","sun"}), description="근무요일"),
+ *     @OA\Property(property="start_time", type="string", format="time", example="09:00:00", description="출근시간"),
+ *     @OA\Property(property="end_time", type="string", format="time", example="18:00:00", description="퇴근시간"),
+ *     @OA\Property(property="break_minutes", type="integer", example=60, minimum=0, maximum=180, description="휴게시간(분)"),
+ *     @OA\Property(property="break_start", type="string", format="time", example="12:00:00", description="휴게시작"),
+ *     @OA\Property(property="break_end", type="string", format="time", example="13:00:00", description="휴게종료")
+ * )
+ *
+ * @OA\Schema(
+ *     schema="AttendanceSetting",
+ *     type="object",
+ *     description="출퇴근 설정 정보",
+ *
+ *     @OA\Property(property="id", type="integer", example=1, description="ID"),
+ *     @OA\Property(property="tenant_id", type="integer", example=1, description="테넌트 ID"),
+ *     @OA\Property(property="use_gps", type="boolean", example=true, description="GPS 출퇴근 사용 여부"),
+ *     @OA\Property(property="allowed_radius", type="integer", example=100, description="허용 반경(m)"),
+ *     @OA\Property(property="hq_address", type="string", example="서울시 강남구 테헤란로 123", nullable=true, description="본사 주소"),
+ *     @OA\Property(property="hq_latitude", type="number", format="float", example=37.5012, nullable=true, description="본사 위도"),
+ *     @OA\Property(property="hq_longitude", type="number", format="float", example=127.0396, nullable=true, description="본사 경도"),
+ *     @OA\Property(property="created_at", type="string", format="date-time"),
+ *     @OA\Property(property="updated_at", type="string", format="date-time")
+ * )
+ *
+ * @OA\Schema(
+ *     schema="AttendanceSettingUpdateRequest",
+ *     type="object",
+ *     description="출퇴근 설정 수정 요청",
+ *
+ *     @OA\Property(property="use_gps", type="boolean", example=true, description="GPS 출퇴근 사용 여부"),
+ *     @OA\Property(property="allowed_radius", type="integer", example=100, minimum=10, maximum=10000, description="허용 반경(m)"),
+ *     @OA\Property(property="hq_address", type="string", example="서울시 강남구 테헤란로 123", description="본사 주소"),
+ *     @OA\Property(property="hq_latitude", type="number", format="float", example=37.5012, minimum=-90, maximum=90, description="본사 위도"),
+ *     @OA\Property(property="hq_longitude", type="number", format="float", example=127.0396, minimum=-180, maximum=180, description="본사 경도")
+ * )
+ */
+class WorkSettingApi
+{
+    /**
+     * @OA\Get(
+     *     path="/api/v1/settings/work",
+     *     tags={"WorkSettings"},
+     *     summary="근무 설정 조회",
+     *     description="테넌트의 근무 설정을 조회합니다. 설정이 없으면 기본값으로 자동 생성됩니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="조회 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", ref="#/components/schemas/WorkSetting")
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function showWorkSetting() {}
+
+    /**
+     * @OA\Put(
+     *     path="/api/v1/settings/work",
+     *     tags={"WorkSettings"},
+     *     summary="근무 설정 수정",
+     *     description="테넌트의 근무 설정을 수정합니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\RequestBody(
+     *         required=true,
+     *
+     *         @OA\JsonContent(ref="#/components/schemas/WorkSettingUpdateRequest")
+     *     ),
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="수정 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", ref="#/components/schemas/WorkSetting")
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=400, description="잘못된 요청", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function updateWorkSetting() {}
+
+    /**
+     * @OA\Get(
+     *     path="/api/v1/settings/attendance",
+     *     tags={"WorkSettings"},
+     *     summary="출퇴근 설정 조회",
+     *     description="테넌트의 출퇴근 설정을 조회합니다. 설정이 없으면 기본값으로 자동 생성됩니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="조회 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", ref="#/components/schemas/AttendanceSetting")
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function showAttendanceSetting() {}
+
+    /**
+     * @OA\Put(
+     *     path="/api/v1/settings/attendance",
+     *     tags={"WorkSettings"},
+     *     summary="출퇴근 설정 수정",
+     *     description="테넌트의 출퇴근 설정을 수정합니다.",
+     *     security={{"ApiKeyAuth":{}},{"BearerAuth":{}}},
+     *
+     *     @OA\RequestBody(
+     *         required=true,
+     *
+     *         @OA\JsonContent(ref="#/components/schemas/AttendanceSettingUpdateRequest")
+     *     ),
+     *
+     *     @OA\Response(
+     *         response=200,
+     *         description="수정 성공",
+     *
+     *         @OA\JsonContent(
+     *             allOf={
+     *
+     *                 @OA\Schema(ref="#/components/schemas/ApiResponse"),
+     *                 @OA\Schema(
+     *
+     *                     @OA\Property(property="data", ref="#/components/schemas/AttendanceSetting")
+     *                 )
+     *             }
+     *         )
+     *     ),
+     *
+     *     @OA\Response(response=400, description="잘못된 요청", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=401, description="인증 실패", @OA\JsonContent(ref="#/components/schemas/ErrorResponse")),
+     *     @OA\Response(response=500, description="서버 에러", @OA\JsonContent(ref="#/components/schemas/ErrorResponse"))
+     * )
+     */
+    public function updateAttendanceSetting() {}
+}
diff --git a/database/migrations/2025_12_17_110000_create_work_settings_table.php b/database/migrations/2025_12_17_110000_create_work_settings_table.php
new file mode 100644
index 0000000..7b23b11
--- /dev/null
+++ b/database/migrations/2025_12_17_110000_create_work_settings_table.php
@@ -0,0 +1,40 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('work_settings', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->unique()->comment('테넌트 ID');
+            $table->string('work_type', 20)->default('fixed')->comment('근무유형: fixed/flexible/custom');
+            $table->integer('standard_hours')->default(40)->comment('주당 소정근로시간');
+            $table->integer('overtime_hours')->default(12)->comment('주당 연장근로시간');
+            $table->integer('overtime_limit')->default(52)->comment('연장근로한도');
+            $table->json('work_days')->nullable()->comment('근무요일 ["mon","tue","wed","thu","fri"]');
+            $table->time('start_time')->default('09:00:00')->comment('출근시간');
+            $table->time('end_time')->default('18:00:00')->comment('퇴근시간');
+            $table->integer('break_minutes')->default(60)->comment('휴게시간(분)');
+            $table->time('break_start')->nullable()->default('12:00:00')->comment('휴게시작');
+            $table->time('break_end')->nullable()->default('13:00:00')->comment('휴게종료');
+            $table->timestamps();
+
+            $table->index('tenant_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('work_settings');
+    }
+};
diff --git a/database/migrations/2025_12_17_110001_create_attendance_settings_table.php b/database/migrations/2025_12_17_110001_create_attendance_settings_table.php
new file mode 100644
index 0000000..4a72e3e
--- /dev/null
+++ b/database/migrations/2025_12_17_110001_create_attendance_settings_table.php
@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('attendance_settings', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->unique()->comment('테넌트 ID');
+            $table->boolean('use_gps')->default(false)->comment('GPS 출퇴근 사용 여부');
+            $table->integer('allowed_radius')->default(100)->comment('허용 반경(m)');
+            $table->string('hq_address', 255)->nullable()->comment('본사 주소');
+            $table->decimal('hq_latitude', 10, 8)->nullable()->comment('본사 위도');
+            $table->decimal('hq_longitude', 11, 8)->nullable()->comment('본사 경도');
+            $table->timestamps();
+
+            $table->index('tenant_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('attendance_settings');
+    }
+};
diff --git a/database/migrations/2025_12_17_110002_create_sites_table.php b/database/migrations/2025_12_17_110002_create_sites_table.php
new file mode 100644
index 0000000..48fe7da
--- /dev/null
+++ b/database/migrations/2025_12_17_110002_create_sites_table.php
@@ -0,0 +1,40 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('sites', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('tenant_id')->comment('테넌트 ID');
+            $table->string('name', 100)->comment('현장명');
+            $table->string('address', 255)->nullable()->comment('현장 주소');
+            $table->decimal('latitude', 10, 8)->nullable()->comment('위도');
+            $table->decimal('longitude', 11, 8)->nullable()->comment('경도');
+            $table->boolean('is_active')->default(true)->comment('활성화 여부');
+            $table->foreignId('created_by')->nullable()->comment('생성자');
+            $table->foreignId('updated_by')->nullable()->comment('수정자');
+            $table->foreignId('deleted_by')->nullable()->comment('삭제자');
+            $table->softDeletes();
+            $table->timestamps();
+
+            $table->index('tenant_id');
+            $table->index('is_active');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('sites');
+    }
+};
diff --git a/lang/ko/error.php b/lang/ko/error.php
index b8618e6..aeb2db4 100644
--- a/lang/ko/error.php
+++ b/lang/ko/error.php
@@ -110,6 +110,8 @@
     'section_not_found' => '섹션을 찾을 수 없습니다.',
     'field_not_found' => '필드를 찾을 수 없습니다.',
     'field_key_reserved' => '":field_key"은(는) 시스템 예약어로 사용할 수 없습니다.',
+    'field_key_system_readonly' => '시스템 필드의 field_key는 변경할 수 없습니다.',
+    'field_key_system_cannot_delete' => '시스템 필드는 삭제할 수 없습니다.',
     'bom_not_found' => 'BOM 항목을 찾을 수 없습니다.',
     'item_type_required' => '품목 유형(item_type)은 필수입니다.',
     'item_type_or_group_required' => '품목 유형(item_type) 또는 그룹 ID(group_id)는 필수입니다.',
@@ -163,4 +165,28 @@
         'overlapping' => '해당 기간에 이미 신청된 휴가가 있습니다.',
         'balance_not_found' => '휴가 잔여일수 정보를 찾을 수 없습니다.',
     ],
+
+    // 근무 설정 관련
+    'work_setting' => [
+        'invalid_work_type' => '유효하지 않은 근무 유형입니다.',
+        'invalid_work_days' => '유효하지 않은 근무요일입니다.',
+        'invalid_time_range' => '출근시간은 퇴근시간보다 이전이어야 합니다.',
+        'break_time_invalid' => '휴게시간 설정이 올바르지 않습니다.',
+    ],
+
+    // 출퇴근 설정 관련
+    'attendance_setting' => [
+        'invalid_radius' => '허용 반경이 유효하지 않습니다.',
+        'invalid_coordinates' => '좌표가 유효하지 않습니다.',
+    ],
+
+    // 현장 관리 관련
+    'site' => [
+        'not_found' => '현장 정보를 찾을 수 없습니다.',
+        'name_required' => '현장명은 필수입니다.',
+        'name_too_long' => '현장명은 100자를 초과할 수 없습니다.',
+        'invalid_latitude' => '위도는 -90 ~ 90 사이여야 합니다.',
+        'invalid_longitude' => '경도는 -180 ~ 180 사이여야 합니다.',
+        'has_dependencies' => '연관된 데이터가 있어 삭제할 수 없습니다.',
+    ],
 ];
diff --git a/lang/ko/message.php b/lang/ko/message.php
index be1f77a..b7b837a 100644
--- a/lang/ko/message.php
+++ b/lang/ko/message.php
@@ -209,4 +209,25 @@
         'balance_fetched' => '잔여 휴가를 조회했습니다.',
         'balance_updated' => '휴가 일수가 설정되었습니다.',
     ],
+
+    // 근무 설정 관리
+    'work_setting' => [
+        'fetched' => '근무 설정을 조회했습니다.',
+        'updated' => '근무 설정이 수정되었습니다.',
+    ],
+
+    // 출퇴근 설정 관리
+    'attendance_setting' => [
+        'fetched' => '출퇴근 설정을 조회했습니다.',
+        'updated' => '출퇴근 설정이 수정되었습니다.',
+    ],
+
+    // 현장 관리
+    'site' => [
+        'fetched' => '현장을 조회했습니다.',
+        'created' => '현장이 등록되었습니다.',
+        'updated' => '현장이 수정되었습니다.',
+        'deleted' => '현장이 삭제되었습니다.',
+        'active_fetched' => '활성화된 현장 목록을 조회했습니다.',
+    ],
 ];
diff --git a/routes/api.php b/routes/api.php
index e8b79f3..15172e8 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -23,7 +23,6 @@
 use App\Http\Controllers\Api\V1\EstimateController;
 use App\Http\Controllers\Api\V1\FileStorageController;
 use App\Http\Controllers\Api\V1\FolderController;
-use App\Http\Controllers\Api\V1\LeaveController;
 use App\Http\Controllers\Api\V1\ItemMaster\CustomTabController;
 use App\Http\Controllers\Api\V1\ItemMaster\EntityRelationshipController;
 use App\Http\Controllers\Api\V1\ItemMaster\ItemBomItemController;
@@ -36,29 +35,32 @@
 use App\Http\Controllers\Api\V1\ItemsBomController;
 use App\Http\Controllers\Api\V1\ItemsController;
 use App\Http\Controllers\Api\V1\ItemsFileController;
-// use App\Http\Controllers\Api\V1\MaterialController; // REMOVED: materials 테이블 삭제됨
+use App\Http\Controllers\Api\V1\LeaveController;
 use App\Http\Controllers\Api\V1\MenuController;
 use App\Http\Controllers\Api\V1\ModelSetController;
+// use App\Http\Controllers\Api\V1\MaterialController; // REMOVED: materials 테이블 삭제됨
 use App\Http\Controllers\Api\V1\PermissionController;
 use App\Http\Controllers\Api\V1\PostController;
 use App\Http\Controllers\Api\V1\PricingController;
-// use App\Http\Controllers\Api\V1\ProductBomItemController; // REMOVED: products 테이블 삭제됨
-// use App\Http\Controllers\Api\V1\ProductController; // REMOVED: products 테이블 삭제됨
 use App\Http\Controllers\Api\V1\QuoteController;
 use App\Http\Controllers\Api\V1\RefreshController;
+// use App\Http\Controllers\Api\V1\ProductBomItemController; // REMOVED: products 테이블 삭제됨
+// use App\Http\Controllers\Api\V1\ProductController; // REMOVED: products 테이블 삭제됨
 use App\Http\Controllers\Api\V1\RegisterController;
 use App\Http\Controllers\Api\V1\RoleController;
 use App\Http\Controllers\Api\V1\RolePermissionController;
+use App\Http\Controllers\Api\V1\SiteController;
 use App\Http\Controllers\Api\V1\TenantController;
-// 설계 전용 (디자인 네임스페이스)
 use App\Http\Controllers\Api\V1\TenantFieldSettingController;
+// 설계 전용 (디자인 네임스페이스)
 use App\Http\Controllers\Api\V1\TenantOptionGroupController;
 use App\Http\Controllers\Api\V1\TenantOptionValueController;
 use App\Http\Controllers\Api\V1\TenantStatFieldController;
 use App\Http\Controllers\Api\V1\TenantUserProfileController;
-// 모델셋 관리 (견적 시스템)
 use App\Http\Controllers\Api\V1\UserController;
+// 모델셋 관리 (견적 시스템)
 use App\Http\Controllers\Api\V1\UserRoleController;
+use App\Http\Controllers\Api\V1\WorkSettingController;
 use Illuminate\Support\Facades\Route;
 
 // V1 초기 개발
@@ -257,6 +259,16 @@
             Route::post('/{id}/cancel', [LeaveController::class, 'cancel'])->name('v1.leaves.cancel');
         });
 
+        // Site API (현장 관리)
+        Route::prefix('sites')->group(function () {
+            Route::get('', [SiteController::class, 'index'])->name('v1.sites.index');
+            Route::post('', [SiteController::class, 'store'])->name('v1.sites.store');
+            Route::get('/active', [SiteController::class, 'active'])->name('v1.sites.active');
+            Route::get('/{id}', [SiteController::class, 'show'])->whereNumber('id')->name('v1.sites.show');
+            Route::put('/{id}', [SiteController::class, 'update'])->whereNumber('id')->name('v1.sites.update');
+            Route::delete('/{id}', [SiteController::class, 'destroy'])->whereNumber('id')->name('v1.sites.destroy');
+        });
+
         // Permission API
         Route::prefix('permissions')->group(function () {
             Route::get('departments/{dept_id}/menu-matrix', [PermissionController::class, 'deptMenuMatrix'])->name('v1.permissions.deptMenuMatrix'); // 부서별 권한 메트릭스
@@ -267,6 +279,14 @@
         // Settings & Configuration (설정 및 환경설정 통합 관리)
         Route::prefix('settings')->group(function () {
 
+            // 근무 설정
+            Route::get('/work', [WorkSettingController::class, 'showWorkSetting'])->name('v1.settings.work.show');
+            Route::put('/work', [WorkSettingController::class, 'updateWorkSetting'])->name('v1.settings.work.update');
+
+            // 출퇴근 설정
+            Route::get('/attendance', [WorkSettingController::class, 'showAttendanceSetting'])->name('v1.settings.attendance.show');
+            Route::put('/attendance', [WorkSettingController::class, 'updateAttendanceSetting'])->name('v1.settings.attendance.update');
+
             // 테넌트 필드 설정 (기존 fields에서 이동)
             Route::get('/fields', [TenantFieldSettingController::class, 'index'])->name('v1.settings.fields.index');        // 필드 설정 목록(전역+테넌트 병합 효과값)
             Route::put('/fields/bulk', [TenantFieldSettingController::class, 'bulkUpsert'])->name('v1.settings.fields.bulk');    // 필드 설정 대량 저장(트랜잭션 처리)