diff --git a/resources/views/rd/fire-shutter-drawing/index.blade.php b/resources/views/rd/fire-shutter-drawing/index.blade.php
index eec6b892..656a5b4c 100644
--- a/resources/views/rd/fire-shutter-drawing/index.blade.php
+++ b/resources/views/rd/fire-shutter-drawing/index.blade.php
@@ -1387,17 +1387,15 @@ function renderSbSide() {
                 ` : '';
             })()}
 
-            <!-- ━━━━━ 슬랫 경로 (레일홀 → 상부 샤프트, 시계방향 감김) ━━━━━ -->
+            <!-- ━━━━━ 슬랫 경로 (레일홀 → 상부 → 샤프트 시계방향 감김) ━━━━━ -->
             ${(() => {
                 const railCx = ox + vt + 30*sc + Math.min(railHoleW, sbFrontW-vt-30*sc)/2;
-                const slatEntryY = shaftCy + rollR; // 슬랫 롤 하단 진입점
+                const rollTopY = shaftCy - rollR;
                 return `
                     <!-- 케이스 외부: 슬랫 하강 -->
                     <line x1="${railCx}" y1="${oy+sH}" x2="${railCx}" y2="${oy+sH+20}" stroke="#f59e0b" stroke-width="2" stroke-dasharray="5 3" opacity="0.5"/>
-                    <!-- 케이스 내부: 레일홀에서 상부로 올라감 -->
-                    <line x1="${railCx}" y1="${oy+sH-vt}" x2="${railCx}" y2="${slatEntryY+15*sc}" stroke="#f59e0b" stroke-width="2" stroke-dasharray="5 3" opacity="0.5"/>
-                    <!-- 샤프트 롤 하단으로 접근 (곡선, 시계방향 진입) -->
-                    <path d="M${railCx},${slatEntryY+15*sc} Q${railCx},${slatEntryY} ${shaftCx-rollR*0.3},${slatEntryY}" stroke="#f59e0b" stroke-width="2" stroke-dasharray="5 3" fill="none" opacity="0.5"/>
+                    <!-- 케이스 내부: 레일홀에서 수직 상승 → 롤 좌측에서 시계방향 감김 -->
+                    <path d="M${railCx},${oy+sH-vt} L${railCx},${shaftCy} C${railCx},${shaftCy-rollR} ${shaftCx-rollR},${rollTopY} ${shaftCx},${rollTopY}" stroke="#f59e0b" stroke-width="2.5" stroke-dasharray="5 3" fill="none" opacity="0.5"/>
                     <text x="${railCx+12}" y="${oy+sH+18}" fill="#94a3b8" font-size="8" font-weight="700" font-family="Pretendard">↓ 슬랫</text>
                 `;
             })()}