diff --git a/src/api/api.ts b/src/api/api.ts
index 113549c..1e12e4c 100644
--- a/src/api/api.ts
+++ b/src/api/api.ts
@@ -1,4 +1,5 @@
 import axios from 'axios';
+import { useAuthStore } from '@/store/auth.store';
 
 const api = axios.create({
   baseURL: process.env.NEXT_PUBLIC_BASE_URL,
@@ -70,8 +71,7 @@ api.interceptors.response.use(
                 } catch (refreshError) {
                   // refreshToken도 만료되었거나 재발급 실패
                   console.error('토큰 재발급 실패:', refreshError);
-                  localStorage.removeItem('accessToken');
-                  localStorage.removeItem('refreshToken');
+                  useAuthStore.getState().logout();
                   throw refreshError;
                 } finally {
                   // 재발급 완료 후 Promise 초기화 (성공/실패 관계없이)
@@ -94,6 +94,7 @@ api.interceptors.response.use(
       }
 
       console.error('인증이 만료되었습니다. 다시 로그인하세요.');
+      useAuthStore.getState().logout();
     }
     return Promise.reject(error);
   }
diff --git a/src/app/_components/common/Header.tsx b/src/app/_components/common/Header.tsx
index fd2e35f..d9b61c6 100644
--- a/src/app/_components/common/Header.tsx
+++ b/src/app/_components/common/Header.tsx
@@ -80,9 +80,7 @@ const Header = () => {
 
   const handleLogout = () => {
     logout();
-    clearUser();
     router.push('/');
-
     setIsProfileOpen(false);
   };
 
@@ -134,12 +132,24 @@ const Header = () => {
                   href="/business"
                   className={dropdownItem}
                   role="menuitem"
+                  onClick={(e) => {
+                    if (!isAuthenticated) {
+                      e.preventDefault();
+                      setOpenLogin(true);
+                    }
+                  }}
                 >
                   작성하기
                 </Link>
                 <button
                   type="button"
-                  onClick={() => setOpenUpload(true)}
+                  onClick={() => {
+                    if (!isAuthenticated) {
+                      setOpenLogin(true);
+                    } else {
+                      setOpenUpload(true);
+                    }
+                  }}
                   className={`${dropdownItem} w-full text-left`}
                   role="menuitem"
                 >
diff --git a/src/app/expert/detail/components/ExpertDetailSidebar.tsx b/src/app/expert/detail/components/ExpertDetailSidebar.tsx
index eb5bb3e..af54d69 100644
--- a/src/app/expert/detail/components/ExpertDetailSidebar.tsx
+++ b/src/app/expert/detail/components/ExpertDetailSidebar.tsx
@@ -1,16 +1,19 @@
 'use client';
 
+import { useState } from 'react';
 import { useRouter } from 'next/navigation';
 import { useExpertStore } from '@/store/expert.store';
 import { useBusinessStore } from '@/store/business.store';
 import { useEvaluationStore } from '@/store/report.store';
 import { useUserStore } from '@/store/user.store';
+import { useAuthStore } from '@/store/auth.store';
 import { useExpertReportDetail } from '@/hooks/queries/useExpert';
 import GrayPlus from '@/assets/icons/gray_plus.svg';
 import GrayCheck from '@/assets/icons/gray_check.svg';
 import WhitePlus from '@/assets/icons/white_plus.svg';
 import BusinessPlanDropdown from './BusinessPlanDropdown';
 import { ExpertDetailResponse } from '@/types/expert/expert.detail';
+import LoginModal from '@/app/_components/common/LoginModal';
 
 interface ExpertDetailSidebarProps {
   expert: ExpertDetailResponse;
@@ -22,9 +25,9 @@ const ExpertDetailSidebar = ({ expert }: ExpertDetailSidebarProps) => {
   const planId = useBusinessStore((s) => s.planId);
   const hasExpertUnlocked = useEvaluationStore((s) => s.hasExpertUnlocked);
   const user = useUserStore((s) => s.user);
-  const hasAccessToken =
-    typeof window !== 'undefined' && !!localStorage.getItem('accessToken');
-  const isMember = hasAccessToken && !!user;
+  const [openLogin, setOpenLogin] = useState(false);
+  const isAuthenticated = useAuthStore((s) => s.isAuthenticated);
+  const isMember = isAuthenticated && !!user;
 
   const { data: reportDetails = [], isLoading: isLoadingReports } =
     useExpertReportDetail(expert.id, {
@@ -63,10 +66,17 @@ const ExpertDetailSidebar = ({ expert }: ExpertDetailSidebarProps) => {
       ? '신청완료'
       : '전문가 연결';
 
+  const requireAuth = () => {
+    if (isAuthenticated) return true;
+    setOpenLogin(true);
+    return false;
+  };
+
   const handleConnect = () => {
     if (!expert) return;
 
     if (shouldShowCreateButton) {
+      if (!requireAuth()) return;
       router.push('/business');
       return;
     }
@@ -112,15 +122,15 @@ const ExpertDetailSidebar = ({ expert }: ExpertDetailSidebarProps) => {
       <button
         onClick={handleConnect}
         disabled={shouldShowCreateButton ? false : disabled}
-        className={`ds-text mt-8 flex w-full items-center justify-center gap-1 rounded-lg px-8 py-[10px] font-medium ${
-          shouldShowCreateButton || (!disabled && !hasRequested)
+        className={`ds-text mt-8 flex w-full items-center justify-center gap-1 rounded-lg px-8 py-[10px] font-medium ${shouldShowCreateButton || (!disabled && !hasRequested)
             ? 'bg-primary-500 hover:bg-primary-700 cursor-pointer text-white'
             : 'cursor-not-allowed bg-gray-200 text-gray-500'
-        }`}
+          }`}
       >
         <ButtonIcon className="h-5 w-5 shrink-0" />
         <span>{buttonText}</span>
       </button>
+      <LoginModal open={openLogin} onClose={() => setOpenLogin(false)} />
     </aside>
   );
 };
diff --git a/src/store/user.store.ts b/src/store/user.store.ts
index 08c49bc..e0c5570 100644
--- a/src/store/user.store.ts
+++ b/src/store/user.store.ts
@@ -38,6 +38,7 @@ export const useUserStore = create<UserState>()(
           }
         } catch (error) {
           console.error('유저를 찾을 수 없습니다', error);
+          set({ user: null });
         }
       },
     }),
diff --git a/tsconfig.json b/tsconfig.json
index a966197..2b452a7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,11 @@
 {
   "compilerOptions": {
     "target": "ES2017",
-    "lib": ["dom", "dom.iterable", "esnext"],
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
     "allowJs": true,
     "skipLibCheck": true,
     "strict": true,
@@ -11,7 +15,7 @@
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "incremental": true,
     "plugins": [
       {
@@ -20,7 +24,9 @@
     ],
     "baseUrl": ".",
     "paths": {
-      "@/*": ["src/*"]
+      "@/*": [
+        "src/*"
+      ]
     }
   },
   "include": [
@@ -30,5 +36,7 @@
     ".next/types/**/*.ts",
     ".next/dev/types/**/*.ts"
   ],
-  "exclude": ["node_modules"]
+  "exclude": [
+    "node_modules"
+  ]
 }