diff --git a/journey/troubleshooting/251128_ir_valuation_frontend_setup.md b/journey/troubleshooting/251128_ir_valuation_frontend_setup.md
index 9d04653..6425be5 100644
--- a/journey/troubleshooting/251128_ir_valuation_frontend_setup.md
+++ b/journey/troubleshooting/251128_ir_valuation_frontend_setup.md
@@ -85,27 +85,36 @@ sudo systemctl reload nginx
 - `App.tsx`에 base path 처리 로직 추가
 - `useLocation` hook으로 `/ir-valuation` base path를 제거하고 라우팅
 
-**파일**: `src/App.tsx:14-25`
+**파일**: `src/App.tsx:14-30`
 ```typescript
 function Router() {
   const [location] = useLocation();
   const basePath = "/ir-valuation";
-  const normalizedLocation = location.startsWith(basePath) 
-    ? location.slice(basePath.length) || "/"
-    : location;
+  
+  // Remove base path from location for routing
+  // Handle both /ir-valuation and /ir-valuation/ cases
+  let normalizedLocation = location;
+  if (location.startsWith(basePath + "/") || location === basePath) {
+    normalizedLocation = location.slice(basePath.length) || "/";
+    // Remove trailing slash if present (except root)
+    if (normalizedLocation !== "/" && normalizedLocation.endsWith("/")) {
+      normalizedLocation = normalizedLocation.slice(0, -1);
+    }
+  }
 
   return (
     <Switch location={normalizedLocation}>
       <Route path="/" component={IRValuationPage} />
-      <Route component={() => <div>404 Not Found</div>} />
+      <Route component={() => <div>404 Not Found - Location: {location}, Normalized: {normalizedLocation}</div>} />
     </Switch>
   );
 }
 ```
 
 **검증**:
-- `https://ro-being.com/ir-valuation/` 접근 시 IR 평가 페이지 정상 표시
+- `https://ro-being.com/ir-valuation/` 접근 시 IR 평가 페이지 정상 표시 확인
 - 네트워크 요청 모두 200 OK 확인
+- ChatGPT 스타일 UI 정상 렌더링 (헤더, 업로드 버튼, 채팅 입력창)
 
 ## 다음 단계