diff --git a/HMH_iOS/HMH_iOS/Application/SceneDelegate.swift b/HMH_iOS/HMH_iOS/Application/SceneDelegate.swift
index 628fc9e..ddb9347 100644
--- a/HMH_iOS/HMH_iOS/Application/SceneDelegate.swift
+++ b/HMH_iOS/HMH_iOS/Application/SceneDelegate.swift
@@ -33,9 +33,11 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         
         let window = UIWindow(windowScene: windowScene)
         self.window = window
-        
         let splashViewController = SplashViewController()
         window.rootViewController = splashViewController
+        if let navigationController = window.rootViewController as? UINavigationController {
+            navigationController.isNavigationBarHidden = true
+        }
         window.makeKeyAndVisible()
         
         DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
diff --git a/HMH_iOS/HMH_iOS/Presentation/Login/ViewControllers/LoginViewController.swift b/HMH_iOS/HMH_iOS/Presentation/Login/ViewControllers/LoginViewController.swift
index 3189ce7..56caf28 100644
--- a/HMH_iOS/HMH_iOS/Presentation/Login/ViewControllers/LoginViewController.swift
+++ b/HMH_iOS/HMH_iOS/Presentation/Login/ViewControllers/LoginViewController.swift
@@ -99,11 +99,9 @@ extension LoginViewController: ASAuthorizationControllerDelegate, ASAuthorizatio
             print(UserManager.shared.getUserIdentifier)
             print(UserManager.shared.getUserName)
             if (UserManager.shared.appleUserIdentifier != nil) {
-                let nextViewController = TabBarController()
-                self.navigationController?.pushViewController(nextViewController, animated: true)
+                setRootViewController(TabBarController())
             } else {
-                let nextViewController = TimeSurveyViewController()
-                self.navigationController?.pushViewController(nextViewController, animated: true)
+                setRootViewController(TimeSurveyViewController())
             }
     
         default:
diff --git a/HMH_iOS/HMH_iOS/Presentation/Onboarding/ViewControllers/SignInCompleteViewController.swift b/HMH_iOS/HMH_iOS/Presentation/Onboarding/ViewControllers/SignInCompleteViewController.swift
index 44cb594..679b6fa 100644
--- a/HMH_iOS/HMH_iOS/Presentation/Onboarding/ViewControllers/SignInCompleteViewController.swift
+++ b/HMH_iOS/HMH_iOS/Presentation/Onboarding/ViewControllers/SignInCompleteViewController.swift
@@ -77,13 +77,7 @@ final class SignInCompleteViewController: OnboardingBaseViewController {
 
 extension SignInCompleteViewController: NextViewPushDelegate {
     func didTapButton() {
-        let nextViewController = TabBarController()
-        let navigationController = UINavigationController(rootViewController: nextViewController)
-        let sceneDelegate = UIApplication.shared.connectedScenes.first?.delegate as? SceneDelegate
-        guard let delegate = sceneDelegate else {
-            return
-        }
-        delegate.window?.rootViewController = navigationController
+        setRootViewController(TabBarController())
     }
 }