diff --git a/backend/__pycache__/database.cpython-313.pyc b/backend/__pycache__/database.cpython-313.pyc
index 96cc71b..5855d1c 100644
Binary files a/backend/__pycache__/database.cpython-313.pyc and b/backend/__pycache__/database.cpython-313.pyc differ
diff --git a/backend/__pycache__/main.cpython-313.pyc b/backend/__pycache__/main.cpython-313.pyc
index aab14f7..c7ab795 100644
Binary files a/backend/__pycache__/main.cpython-313.pyc and b/backend/__pycache__/main.cpython-313.pyc differ
diff --git a/frontend/src/app/(auth)/signin/page.tsx b/frontend/src/app/(auth)/signin/page.tsx
index 3de81d0..9db3e71 100644
--- a/frontend/src/app/(auth)/signin/page.tsx
+++ b/frontend/src/app/(auth)/signin/page.tsx
@@ -17,7 +17,7 @@ export default function Page() {
   });
 
   // const [signIn, {isError, isSuccess, error, data}] = useSignInMutation();
-  const { mutate: signInMutation, isError, error, data } = useMutation({
+  const { mutate: signInMutation, isError,isSuccess, error, data } = useMutation({
     mutationFn: ({username, password}: {username: string, password: string}) => signIn(username, password),
   });
 
@@ -39,7 +39,7 @@ export default function Page() {
       return;
     } 
 
-    if(data){
+    if(isSuccess){
       alert('로그인에 성공했습니다.');
       console.log('data:', data);
 
diff --git a/frontend/src/app/(auth)/signup/page.tsx b/frontend/src/app/(auth)/signup/page.tsx
index 7443fad..2e375fc 100644
--- a/frontend/src/app/(auth)/signup/page.tsx
+++ b/frontend/src/app/(auth)/signup/page.tsx
@@ -18,7 +18,7 @@ const INITIAL_FORM = {
 export default function Page() {
   const [form, setForm] = useState(INITIAL_FORM);
 
-  const { mutate: signUpMutation, isError, error } = useMutation({
+  const { mutate: signUpMutation, isError, isSuccess, error } = useMutation({
     mutationFn: ({username, password}: {username: string, password: string}) => signUp(username, password),
   });
 
@@ -44,8 +44,10 @@ export default function Page() {
       return;
     } 
 
-    alert('회원가입에 성공했습니다.');
-    router.push('/signin');
+    if(isSuccess){
+      alert('회원가입에 성공했습니다.');
+      router.push('/signin');
+    }
   };
 
   return (