diff --git a/ByeBoo-iOS/ByeBoo-iOS/Data/Persistence/UserDefaultsKey.swift b/ByeBoo-iOS/ByeBoo-iOS/Data/Persistence/UserDefaultsKey.swift
index d9432c00..741bdc25 100644
--- a/ByeBoo-iOS/ByeBoo-iOS/Data/Persistence/UserDefaultsKey.swift
+++ b/ByeBoo-iOS/ByeBoo-iOS/Data/Persistence/UserDefaultsKey.swift
@@ -10,7 +10,6 @@ import Foundation
 enum UserDefaultsKey: String, CaseIterable {
     case userName
     case userID
-    case isOnboardingCompleted
     case isHelperShown
     case isRegistered
     case loginPlatform
diff --git a/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/AuthRepository.swift b/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/AuthRepository.swift
index b558ea0d..c25722e2 100644
--- a/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/AuthRepository.swift
+++ b/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/AuthRepository.swift
@@ -97,12 +97,12 @@ struct DefaultAuthRepository: AuthInterface {
     }
     
     func autoLogin() async throws -> Bool {
-        let isOnboardingCompleted: Bool = userDefaultsService.load(key: .isOnboardingCompleted) ?? false
-        ByeBooLogger.debug("온보딩 여부 \(isOnboardingCompleted)")
+        let isRegistered: Bool = userDefaultsService.load(key: .isRegistered) ?? false
+        ByeBooLogger.debug("온보딩 여부 \(isRegistered)")
         
         if !keychainService.load(key: .accessToken).isEmpty
             && !keychainService.load(key: .refreshToken).isEmpty
-            && isOnboardingCompleted
+            && isRegistered
         {
             ByeBooLogger.debug("정보 있음")
             try await tokenService.reissue()
@@ -136,7 +136,7 @@ struct DefaultAuthRepository: AuthInterface {
         }
         
         clearKeychain()
-        removeUserInfo(excludedKeys: [.isOnboardingCompleted, .isHelperShown, .hasEnterMyPage])
+        removeUserInfo(excludedKeys: [.isRegistered, .isHelperShown, .hasEnterMyPage])
         
         return true
     }
diff --git a/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/UsersRepository.swift b/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/UsersRepository.swift
index 8d3e6a01..74174372 100644
--- a/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/UsersRepository.swift
+++ b/ByeBoo-iOS/ByeBoo-iOS/Data/Repository/UsersRepository.swift
@@ -50,7 +50,7 @@ struct DefaultUsersRepository: UsersInterface {
         )
         let _ = userDefaultsService.save(result.id, key: .userID)
         let _ = userDefaultsService.save(result.name, key: .userName)
-        let _ = userDefaultsService.save(true, key: .isOnboardingCompleted)
+        let _ = userDefaultsService.save(true, key: .isRegistered)
         let _ = userDefaultsService.save(false, key: .hasEnterMyPage)
         let _ = userDefaultsService.save(false, key: .alarmEnabled)
         
diff --git a/ByeBoo-iOS/ByeBooTests/Feature/Login/AuthTests.swift b/ByeBoo-iOS/ByeBooTests/Feature/Login/AuthTests.swift
index 0b783bad..c5b53e1c 100644
--- a/ByeBoo-iOS/ByeBooTests/Feature/Login/AuthTests.swift
+++ b/ByeBoo-iOS/ByeBooTests/Feature/Login/AuthTests.swift
@@ -15,14 +15,14 @@ struct AuthTests {
     private let networkService = MockNetworkService(userAPI: MockUserAPI(isAvailable: true))
     
     @Test("🏁 isOnboardingCompleted가 true일 때 ✅ 자동로그인 success")
-    func isOnboardingCompleted_true__autoLogin_success() async throws {
+    func isRegistered_true__autoLogin_success() async throws {
         // Given
         let authRepository = MockAuthRepository(
             network: networkService,
             userDefaultsService: userDefaultsService,
             keychainService: keychainService
         )
-        let _ = userDefaultsService.save(true, key: .isOnboardingCompleted)
+        let _ = userDefaultsService.save(true, key: .isRegistered)
         let autoLoginUseCase = DefaultAutoLoginUseCase(repository: authRepository)
         
         // When