diff --git a/SOPTving/SOPTving/Application/SceneDelegate.swift b/SOPTving/SOPTving/Application/SceneDelegate.swift
index d14a33c..0598fdc 100644
--- a/SOPTving/SOPTving/Application/SceneDelegate.swift
+++ b/SOPTving/SOPTving/Application/SceneDelegate.swift
@@ -16,7 +16,7 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
         
         guard let windowScene = (scene as? UIWindowScene) else { return }
         window = UIWindow(windowScene: windowScene)
-        window?.rootViewController = MainVC()
+        window?.rootViewController = OnboardingVC()
         window?.makeKeyAndVisible()
     }
 
diff --git a/SOPTving/SOPTving/Presentation/AuthScene/View/AuthTextField.swift b/SOPTving/SOPTving/Presentation/AuthScene/View/AuthTextField.swift
index 978b8d4..0c0936d 100644
--- a/SOPTving/SOPTving/Presentation/AuthScene/View/AuthTextField.swift
+++ b/SOPTving/SOPTving/Presentation/AuthScene/View/AuthTextField.swift
@@ -34,7 +34,7 @@ final class AuthTextField : UITextField {
         case hideButton
     }
     
-    private var textFieldType: TextFieldType = .id
+    private var textFieldType: TextFieldType
     
     //MARK: - UI Components
     
diff --git a/SOPTving/SOPTving/Presentation/AuthScene/VC/OnboardingVC.swift b/SOPTving/SOPTving/Presentation/AuthScene/ViewContoller/OnboardingVC.swift
similarity index 92%
rename from SOPTving/SOPTving/Presentation/AuthScene/VC/OnboardingVC.swift
rename to SOPTving/SOPTving/Presentation/AuthScene/ViewContoller/OnboardingVC.swift
index 75cf3da..2eb85dd 100644
--- a/SOPTving/SOPTving/Presentation/AuthScene/VC/OnboardingVC.swift
+++ b/SOPTving/SOPTving/Presentation/AuthScene/ViewContoller/OnboardingVC.swift
@@ -14,6 +14,7 @@ final class OnboardingVC: UIViewController {
     
     //MARK: - Properties
     
+    
     //MARK: - UI Components
     
     private let onboardingImageView: UIImageView = {
@@ -33,7 +34,7 @@ final class OnboardingVC: UIViewController {
     
     
     //MARK: - Life Cycle
-
+    
     override func viewDidLoad() {
         super.viewDidLoad()
         
@@ -54,10 +55,7 @@ extension OnboardingVC {
     
     @objc
     private func startButtonDidTap() {
-//        let signInSelectVC = SignInSelectVC()
-//        present(signInSelectVC, animated: true)
-        
-        let signInVC = SignInVC()
+        let signInVC = SignInVC(viewModel: DefaultSignInViewModel())
         present(signInVC, animated: true)
     }
 }
diff --git a/SOPTving/SOPTving/Presentation/AuthScene/VC/SignInVC.swift b/SOPTving/SOPTving/Presentation/AuthScene/ViewContoller/SignInVC.swift
similarity index 94%
rename from SOPTving/SOPTving/Presentation/AuthScene/VC/SignInVC.swift
rename to SOPTving/SOPTving/Presentation/AuthScene/ViewContoller/SignInVC.swift
index 3237cb2..e3a5740 100644
--- a/SOPTving/SOPTving/Presentation/AuthScene/VC/SignInVC.swift
+++ b/SOPTving/SOPTving/Presentation/AuthScene/ViewContoller/SignInVC.swift
@@ -15,6 +15,8 @@ final class SignInVC: UIViewController {
     
     //MARK: - Properties
     
+    private let viewModel: SignInViewModel
+
     //MARK: - UI Components
     
     private lazy var backButton = UIButton().then {
@@ -58,6 +60,11 @@ final class SignInVC: UIViewController {
     
     //MARK: - Life Cycle
     
+    init(viewModel: SignInViewModel) {
+        self.viewModel = viewModel
+        super.init(nibName: nil, bundle: nil)
+    }
+    
     override func viewDidLoad() {
         super.viewDidLoad()
         
@@ -69,6 +76,9 @@ final class SignInVC: UIViewController {
         updateSignInButtonUI()
     }
     
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
 }
 
 //MARK: - Methods
@@ -114,7 +124,6 @@ extension SignInVC {
     @objc
     private func signInButtonDidTap() {
         let mainVC = MainVC()
-        //guard let name = idTextField.text else { return }
         UIApplication.shared.changeRootViewController(mainVC)
     }
 }
diff --git a/SOPTving/SOPTving/Utility/Extension/UIApplication+.swift b/SOPTving/SOPTving/Utility/Extension/UIApplication+.swift
index 2829ed9..1e30e5f 100644
--- a/SOPTving/SOPTving/Utility/Extension/UIApplication+.swift
+++ b/SOPTving/SOPTving/Utility/Extension/UIApplication+.swift
@@ -16,9 +16,12 @@ extension UIApplication {
         let firstWindow = windowScenes?.windows.filter { $0.isKeyWindow }.first
         firstWindow?.rootViewController = viewController
         firstWindow?.makeKeyAndVisible()
+        
         UIView.transition(with: firstWindow!,
                           duration: 0.5,
                           options: .transitionCrossDissolve,
                           animations: nil)
     }
+    
+    
 }