diff --git a/src/main/kotlin/com/hero/alignlab/domain/auth/application/AuthFacade.kt b/src/main/kotlin/com/hero/alignlab/domain/auth/application/AuthFacade.kt
index 868d617..f694930 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/auth/application/AuthFacade.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/auth/application/AuthFacade.kt
@@ -35,14 +35,14 @@ class AuthFacade(
         private val TOKEN_EXPIRED_DATE = LocalDateTime.of(2024, 12, 29, 0, 0, 0)
     }
 
-    fun resolveAuthUser(token: AuthUserToken): AuthUser {
+    suspend fun resolveAuthUser(token: AuthUserToken): AuthUser {
         val payload = jwtTokenService.verifyToken(token)
 
         if (payload.type != "accessToken") {
             throw InvalidTokenException(ErrorCode.INVALID_ACCESS_TOKEN)
         }
 
-        val user = userInfoService.getUserByIdOrThrowSync(payload.id)
+        val user = userInfoService.getUserByIdOrThrow(payload.id)
 
         return AuthUserImpl.from(user)
     }
@@ -86,7 +86,7 @@ class AuthFacade(
     }
 
     suspend fun signIn(request: SignInRequest): SignInResponse {
-        val userInfo = userInfoService.findByCredential(request.username, request.password)
+        val userInfo = userInfoService.findByCredentialOrThrow(request.username, request.password)
 
         val accessToken = jwtTokenService.createToken(userInfo.id, TOKEN_EXPIRED_DATE)
 
diff --git a/src/main/kotlin/com/hero/alignlab/domain/user/application/UserInfoService.kt b/src/main/kotlin/com/hero/alignlab/domain/user/application/UserInfoService.kt
index 1fd1dfb..018411e 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/user/application/UserInfoService.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/user/application/UserInfoService.kt
@@ -57,29 +57,21 @@ class UserInfoService(
         return UserInfoResponse.from(userInfo)
     }
 
-    suspend fun findByCredential(username: String, password: String): UserInfo {
+    suspend fun findByCredentialOrThrow(username: String, password: String): UserInfo {
         return withContext(Dispatchers.IO) {
-            findByCredentialSync(username, password)
+            userInfoRepository.findByCredential(
+                username = username,
+                password = EncryptData.enc(password, encryptor)
+            )
         } ?: throw NotFoundException(ErrorCode.NOT_FOUND_USER_ERROR)
     }
 
-    private fun findByCredentialSync(username: String, password: String): UserInfo? {
-        return userInfoRepository.findByCredential(
-            username = username,
-            password = EncryptData.enc(password, encryptor)
-        )
-    }
-
     suspend fun findAllByIds(ids: List<Long>): List<UserInfo> {
         return withContext(Dispatchers.IO) {
-            findAllByIdsSync(ids)
+            userInfoRepository.findAllById(ids)
         }
     }
 
-    fun findAllByIdsSync(ids: List<Long>): List<UserInfo> {
-        return userInfoRepository.findAllById(ids)
-    }
-
     suspend fun findByOAuthOrThrow(provider: OAuthProvider, oauthId: String): UserInfo {
         return withContext(Dispatchers.IO) {
             userInfoRepository.findByOAuth(provider, oauthId)