diff --git a/feature/src/main/AndroidManifest.xml b/feature/src/main/AndroidManifest.xml
index 75bf52d..214feab 100644
--- a/feature/src/main/AndroidManifest.xml
+++ b/feature/src/main/AndroidManifest.xml
@@ -9,7 +9,7 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.NOWSOPTAndroid">
         <activity
-            android:name="com.sopt.now.feature.auth.LoginActivity"
+            android:name="com.sopt.now.feature.MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -17,13 +17,6 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity
-            android:name="com.sopt.now.feature.auth.SignUpActivity"
-            android:exported="false"
-            android:windowSoftInputMode="adjustResize" />
-        <activity
-            android:name="com.sopt.now.feature.MainActivity"
-            android:exported="false" />
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/feature/src/main/java/com/sopt/now/feature/MainActivity.kt b/feature/src/main/java/com/sopt/now/feature/MainActivity.kt
index c922a13..047ec3b 100644
--- a/feature/src/main/java/com/sopt/now/feature/MainActivity.kt
+++ b/feature/src/main/java/com/sopt/now/feature/MainActivity.kt
@@ -1,10 +1,15 @@
 package com.sopt.now.feature
 
+import android.util.Log
+import android.view.MotionEvent
 import android.view.View
+import android.view.inputmethod.InputMethodManager
 import androidx.activity.OnBackPressedCallback
+import androidx.activity.viewModels
 import androidx.lifecycle.flowWithLifecycle
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.NavController
+import androidx.navigation.Navigation
 import androidx.navigation.fragment.NavHostFragment
 import androidx.navigation.fragment.findNavController
 import androidx.navigation.ui.setupWithNavController
@@ -23,9 +28,12 @@ class MainActivity : BindingActivity<ActivityMainBinding>(R.layout.activity_main
     private var backPressedTime = 0L
     private val backPressedFlow = MutableSharedFlow<Unit>()
 
+    private val viewModel: MainViewModel by viewModels()
+
     override fun initView() {
         initMainBottomNavigation()
         initBackDoublePressed()
+        observeAutoLogin()
     }
 
     private fun initMainBottomNavigation() {
@@ -33,6 +41,7 @@ class MainActivity : BindingActivity<ActivityMainBinding>(R.layout.activity_main
             (supportFragmentManager.findFragmentById(R.id.fcv_home) as NavHostFragment)
                 .findNavController()
         binding.bnvHome.setupWithNavController(navController)
+        navController.navigate(R.id.fragment_login)
         doubleBackPressedOnHomeTab(navController)
         setBottomNavigationVisibility(navController)
     }
@@ -82,4 +91,47 @@ class MainActivity : BindingActivity<ActivityMainBinding>(R.layout.activity_main
             snackBar(binding.root, getString(R.string.main_back_once_pressed_exit))
         }
     }
+
+    private fun observeAutoLogin() {
+        viewModel.autoLoginState.flowWithLifecycle(lifecycle).onEach { isAutoLogin ->
+            val navController = Navigation.findNavController(this, R.id.fcv_home)
+            when (isAutoLogin) {
+                true -> navController.navigate(R.id.fragment_home)
+                false -> navController.navigate(R.id.fragment_login)
+            }
+        }.launchIn(lifecycleScope)
+    }
+
+    override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+        val imm: InputMethodManager =
+            getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
+        imm.hideSoftInputFromWindow(currentFocus?.windowToken, 0)
+        return super.dispatchTouchEvent(ev)
+    }
+
+    override fun onResume() {
+        super.onResume()
+
+        logFragmentStack()
+    }
+
+    private fun logFragmentStack() {
+        val fragmentManager =
+            supportFragmentManager.findFragmentById(R.id.fcv_home) as NavHostFragment
+
+        fragmentManager.childFragmentManager.addOnBackStackChangedListener {
+            if (fragmentManager.childFragmentManager.backStackEntryCount == 0) {
+                Log.i(
+                    "backstack",
+                    fragmentManager.childFragmentManager.backStackEntryCount.toString()
+                )
+
+            } else {
+                Log.i(
+                    "backstack",
+                    fragmentManager.childFragmentManager.backStackEntryCount.toString()
+                )
+            }
+        }
+    }
 }
diff --git a/feature/src/main/java/com/sopt/now/feature/MainViewModel.kt b/feature/src/main/java/com/sopt/now/feature/MainViewModel.kt
new file mode 100644
index 0000000..83d4361
--- /dev/null
+++ b/feature/src/main/java/com/sopt/now/feature/MainViewModel.kt
@@ -0,0 +1,31 @@
+package com.sopt.now.feature
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.sopt.now.domain.usecase.sharedprefusecase.GetCheckLoginUseCase
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+import javax.inject.Inject
+
+@HiltViewModel
+class MainViewModel @Inject constructor(
+    private val getCheckLoginUseCase: GetCheckLoginUseCase,
+) : ViewModel() {
+    private val _autoLoginState = MutableStateFlow<Boolean>(false)
+    val autoLoginState: StateFlow<Boolean> get() = _autoLoginState.asStateFlow()
+
+    init {
+        checkAutoLogin()
+    }
+
+    private fun checkAutoLogin() {
+        viewModelScope.launch {
+            _autoLoginState.value = isAutoLogin()
+        }
+    }
+
+    private fun isAutoLogin(): Boolean = getCheckLoginUseCase.invoke()
+}
\ No newline at end of file
diff --git a/feature/src/main/java/com/sopt/now/feature/auth/LoginActivity.kt b/feature/src/main/java/com/sopt/now/feature/auth/LoginActivity.kt
deleted file mode 100644
index f119526..0000000
--- a/feature/src/main/java/com/sopt/now/feature/auth/LoginActivity.kt
+++ /dev/null
@@ -1,101 +0,0 @@
-package com.sopt.now.feature.auth
-
-import android.content.Intent
-import android.view.MotionEvent
-import android.view.inputmethod.InputMethodManager
-import androidx.activity.result.ActivityResultLauncher
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.activity.viewModels
-import androidx.lifecycle.flowWithLifecycle
-import androidx.lifecycle.lifecycleScope
-import com.sopt.now.core.base.BindingActivity
-import com.sopt.now.core.util.context.snackBar
-import com.sopt.now.core.util.context.toast
-import com.sopt.now.core.util.intent.getSafeParcelable
-import com.sopt.now.core.util.intent.navigateTo
-import com.sopt.now.core.view.UiState
-import com.sopt.now.feature.MainActivity
-import com.sopt.now.feature.R
-import com.sopt.now.feature.databinding.ActivityLoginBinding
-import com.sopt.now.feature.model.User
-import com.sopt.now.feature.util.KeyStorage
-import dagger.hilt.android.AndroidEntryPoint
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
-
-@AndroidEntryPoint
-class LoginActivity : BindingActivity<ActivityLoginBinding>(R.layout.activity_login) {
-    private lateinit var resultLauncher: ActivityResultLauncher<Intent>
-    private val viewModel by viewModels<LoginViewModel>()
-
-    override fun initView() {
-        initAutoLoginStateObserve()
-        initRegisterResultLauncher()
-        initBtnClickListener()
-        initSignUpStateObserve()
-    }
-
-    private fun initAutoLoginStateObserve() {
-        viewModel.autoLoginState.flowWithLifecycle(lifecycle).onEach { isAutoLogin ->
-            when (isAutoLogin) {
-                true -> navigateTo<MainActivity>(this@LoginActivity)
-                false -> return@onEach
-            }
-        }.launchIn(lifecycleScope)
-    }
-
-    private fun initRegisterResultLauncher() {
-        resultLauncher =
-            registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-                if (result.resultCode == RESULT_OK) {
-                    result.data?.getSafeParcelable<User>(name = KeyStorage.USER_INPUT)
-                        ?.let { receivedUserInput ->
-                            viewModel.setSavedUserInfo(receivedUserInput.toUserEntity())
-                        }
-                }
-            }
-    }
-
-    private fun initBtnClickListener() {
-        initLoginBtnClickListener()
-        initSignUpBtnClickListener()
-    }
-
-    private fun initLoginBtnClickListener() = with(binding) {
-        btnLogin.setOnClickListener {
-            viewModel.setLogin(
-                id = etLoginId.text.toString(),
-                pwd = etLoginPwd.text.toString()
-            )
-        }
-    }
-
-    private fun initSignUpBtnClickListener() {
-        binding.tvLoginSignUp.setOnClickListener {
-            val intent = Intent(this@LoginActivity, SignUpActivity::class.java)
-            resultLauncher.launch(intent)
-        }
-    }
-
-    private fun initSignUpStateObserve() {
-        viewModel.loginState.flowWithLifecycle(lifecycle).onEach { state ->
-            when (state) {
-                is UiState.Success -> {
-                    toast(getString(R.string.login_completed, getString(R.string.login)))
-                    viewModel.saveCheckLoginSharedPreference(true)
-                    navigateTo<MainActivity>(this)
-                }
-
-                is UiState.Failure -> snackBar(binding.root, state.errorMessage)
-                else -> Unit
-            }
-        }.launchIn(lifecycleScope)
-    }
-
-    override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
-        val imm: InputMethodManager =
-            getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
-        imm.hideSoftInputFromWindow(currentFocus?.windowToken, 0)
-        return super.dispatchTouchEvent(ev)
-    }
-}
diff --git a/feature/src/main/java/com/sopt/now/feature/auth/LoginFragment.kt b/feature/src/main/java/com/sopt/now/feature/auth/LoginFragment.kt
new file mode 100644
index 0000000..c80701e
--- /dev/null
+++ b/feature/src/main/java/com/sopt/now/feature/auth/LoginFragment.kt
@@ -0,0 +1,64 @@
+package com.sopt.now.feature.auth
+
+import androidx.fragment.app.viewModels
+import androidx.lifecycle.flowWithLifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.navigation.NavOptions
+import androidx.navigation.fragment.findNavController
+import com.sopt.now.core.base.BindingFragment
+import com.sopt.now.core.util.fragment.snackBar
+import com.sopt.now.core.util.fragment.toast
+import com.sopt.now.core.view.UiState
+import com.sopt.now.feature.R
+import com.sopt.now.feature.databinding.FragmentLoginBinding
+import dagger.hilt.android.AndroidEntryPoint
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+
+@AndroidEntryPoint
+class LoginFragment : BindingFragment<FragmentLoginBinding>(R.layout.fragment_login) {
+    private val viewModel by viewModels<LoginViewModel>()
+
+    override fun initView() {
+        initBtnClickListener()
+        initSignUpStateObserve()
+    }
+
+    private fun initBtnClickListener() {
+        initLoginBtnClickListener()
+        initSignUpBtnClickListener()
+    }
+
+    private fun initLoginBtnClickListener() = with(binding) {
+        btnLogin.setOnClickListener {
+            viewModel.setLogin(
+                id = etLoginId.text.toString(),
+                pwd = etLoginPwd.text.toString()
+            )
+        }
+    }
+
+    private fun initSignUpBtnClickListener() {
+        binding.tvLoginSignUp.setOnClickListener {
+            findNavController().navigate(R.id.fragment_sign_up)
+        }
+    }
+
+    private fun initSignUpStateObserve() {
+        viewModel.loginState.flowWithLifecycle(lifecycle).onEach { state ->
+            when (state) {
+                is UiState.Success -> {
+                    toast(getString(R.string.login_completed, getString(R.string.login)))
+                    viewModel.saveCheckLoginSharedPreference(true)
+                    val navOptions = NavOptions.Builder()
+                        .setPopUpTo(R.id.nav_graph, true)
+                        .build()
+                    findNavController().navigate(R.id.fragment_home, null, navOptions)
+                }
+
+                is UiState.Failure -> snackBar(binding.root, state.errorMessage)
+                else -> Unit
+            }
+        }.launchIn(lifecycleScope)
+    }
+}
diff --git a/feature/src/main/java/com/sopt/now/feature/auth/LoginViewModel.kt b/feature/src/main/java/com/sopt/now/feature/auth/LoginViewModel.kt
index c2dd1a4..d4bb0ca 100644
--- a/feature/src/main/java/com/sopt/now/feature/auth/LoginViewModel.kt
+++ b/feature/src/main/java/com/sopt/now/feature/auth/LoginViewModel.kt
@@ -2,27 +2,24 @@ package com.sopt.now.feature.auth
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import com.sopt.now.feature.util.StringResources
 import com.sopt.now.core.view.UiState
 import com.sopt.now.domain.entity.UserEntity
-import com.sopt.now.domain.usecase.sharedprefusecase.GetCheckLoginUseCase
 import com.sopt.now.domain.usecase.sharedprefusecase.GetUserInfoUseCase
 import com.sopt.now.domain.usecase.sharedprefusecase.SaveCheckLoginUseCase
+import com.sopt.now.feature.util.StringResources
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asSharedFlow
-import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
 @HiltViewModel
 class LoginViewModel @Inject constructor(
     private val getUserInfoUseCase: GetUserInfoUseCase,
-    private val getCheckLoginUseCase: GetCheckLoginUseCase,
-    private val saveCheckLoginUseCase: SaveCheckLoginUseCase
+    private val saveCheckLoginUseCase: SaveCheckLoginUseCase,
 ) : ViewModel() {
     private val _savedUserInfo = MutableStateFlow<UserEntity>(
         UserEntity(
@@ -37,32 +34,21 @@ class LoginViewModel @Inject constructor(
     private val _loginState = MutableSharedFlow<UiState<UserEntity>>()
     val loginState: SharedFlow<UiState<UserEntity>> get() = _loginState.asSharedFlow()
 
-    private val _autoLoginState = MutableStateFlow<Boolean>(false)
-    val autoLoginState: StateFlow<Boolean> get() = _autoLoginState.asStateFlow()
-
     init {
-        checkAutoLogin()
+        getUserInfo()
     }
 
-    private fun checkAutoLogin() {
+    private fun getUserInfo() {
         viewModelScope.launch {
-            _autoLoginState.value = isAutoLogin()
-            if (!isAutoLogin()) {
-                _savedUserInfo.value = getUserInfoUseCase.invoke()
-            }
+            _savedUserInfo.value = getUserInfoUseCase.invoke()
+
         }
     }
 
-    private fun isAutoLogin(): Boolean = getCheckLoginUseCase.invoke()
-
     fun saveCheckLoginSharedPreference(input: Boolean) {
         saveCheckLoginUseCase.invoke(input)
     }
 
-    fun setSavedUserInfo(input: UserEntity) {
-        _savedUserInfo.value = input
-    }
-
     fun setLogin(id: String, pwd: String) {
         checkLoginValidate(id, pwd)
     }
diff --git a/feature/src/main/java/com/sopt/now/feature/auth/SignUpActivity.kt b/feature/src/main/java/com/sopt/now/feature/auth/SignUpFragment.kt
similarity index 60%
rename from feature/src/main/java/com/sopt/now/feature/auth/SignUpActivity.kt
rename to feature/src/main/java/com/sopt/now/feature/auth/SignUpFragment.kt
index 479b558..236e0a5 100644
--- a/feature/src/main/java/com/sopt/now/feature/auth/SignUpActivity.kt
+++ b/feature/src/main/java/com/sopt/now/feature/auth/SignUpFragment.kt
@@ -1,25 +1,22 @@
 package com.sopt.now.feature.auth
 
-import android.content.Intent
-import android.view.MotionEvent
-import android.view.inputmethod.InputMethodManager
-import androidx.activity.viewModels
+import androidx.fragment.app.viewModels
 import androidx.lifecycle.flowWithLifecycle
 import androidx.lifecycle.lifecycleScope
-import com.sopt.now.core.base.BindingActivity
-import com.sopt.now.core.util.context.snackBar
-import com.sopt.now.core.util.context.toast
+import androidx.navigation.fragment.findNavController
+import com.sopt.now.core.base.BindingFragment
+import com.sopt.now.core.util.fragment.snackBar
+import com.sopt.now.core.util.fragment.toast
 import com.sopt.now.core.view.UiState
 import com.sopt.now.feature.R
-import com.sopt.now.feature.databinding.ActivitySignUpBinding
+import com.sopt.now.feature.databinding.FragmentSignUpBinding
 import com.sopt.now.feature.model.User
-import com.sopt.now.feature.util.KeyStorage
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 
 @AndroidEntryPoint
-class SignUpActivity : BindingActivity<ActivitySignUpBinding>(R.layout.activity_sign_up) {
+class SignUpFragment : BindingFragment<FragmentSignUpBinding>(R.layout.fragment_sign_up) {
     private val viewModel by viewModels<SignUpViewModel>()
 
     override fun initView() {
@@ -50,7 +47,7 @@ class SignUpActivity : BindingActivity<ActivitySignUpBinding>(R.layout.activity_
                 is UiState.Success -> {
                     toast(getString(R.string.login_completed, getString(R.string.sign_up)))
                     viewModel.saveUserInfoSharedPreference(state.data.toUserEntity())
-                    navigateToLoginActivity(state.data)
+                    findNavController().navigate(R.id.fragment_login)
                 }
 
                 is UiState.Failure -> {
@@ -62,19 +59,4 @@ class SignUpActivity : BindingActivity<ActivitySignUpBinding>(R.layout.activity_
         }.launchIn(lifecycleScope)
     }
 
-    private fun navigateToLoginActivity(userInputData: User) {
-        Intent().apply {
-            putExtra(KeyStorage.USER_INPUT, userInputData)
-        }.also {
-            setResult(RESULT_OK, it)
-            finish()
-        }
-    }
-
-    override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
-        val imm: InputMethodManager =
-            getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
-        imm.hideSoftInputFromWindow(currentFocus?.windowToken, 0)
-        return super.dispatchTouchEvent(ev)
-    }
 }
diff --git a/feature/src/main/java/com/sopt/now/feature/mypage/MyPageFragment.kt b/feature/src/main/java/com/sopt/now/feature/mypage/MyPageFragment.kt
index fdeb08f..df94e6e 100644
--- a/feature/src/main/java/com/sopt/now/feature/mypage/MyPageFragment.kt
+++ b/feature/src/main/java/com/sopt/now/feature/mypage/MyPageFragment.kt
@@ -1,11 +1,11 @@
 package com.sopt.now.feature.mypage
 
 import androidx.fragment.app.viewModels
+import androidx.navigation.NavOptions
+import androidx.navigation.fragment.findNavController
 import com.sopt.now.core.base.BindingFragment
 import com.sopt.now.core.util.fragment.toast
-import com.sopt.now.core.util.intent.navigateTo
 import com.sopt.now.feature.R
-import com.sopt.now.feature.auth.LoginActivity
 import com.sopt.now.feature.databinding.FragmentMyPageBinding
 import dagger.hilt.android.AndroidEntryPoint
 
@@ -26,7 +26,12 @@ class MyPageFragment : BindingFragment<FragmentMyPageBinding>(R.layout.fragment_
         binding.tvMainSignOut.setOnClickListener {
             viewModel.updateCheckLoginState(false)
             toast(getString(R.string.login_completed, getString(R.string.main_logout_under_bar)))
-            navigateTo<LoginActivity>(requireContext())
+
+            val navOptions = NavOptions.Builder()
+                .setPopUpTo(R.id.nav_graph, true)
+                .build()
+
+            findNavController().navigate(R.id.fragment_login, null, navOptions)
         }
     }
 
@@ -39,7 +44,11 @@ class MyPageFragment : BindingFragment<FragmentMyPageBinding>(R.layout.fragment_
                     getString(R.string.main_clear_user_under_bar)
                 )
             )
-            navigateTo<LoginActivity>(requireContext())
+
+            val navOptions = NavOptions.Builder()
+                .setPopUpTo(R.id.nav_graph, true)
+                .build()
+            findNavController().navigate(R.id.fragment_login, null, navOptions)
         }
     }
 
diff --git a/feature/src/main/res/layout/activity_login.xml b/feature/src/main/res/layout/fragment_login.xml
similarity index 100%
rename from feature/src/main/res/layout/activity_login.xml
rename to feature/src/main/res/layout/fragment_login.xml
diff --git a/feature/src/main/res/layout/activity_sign_up.xml b/feature/src/main/res/layout/fragment_sign_up.xml
similarity index 100%
rename from feature/src/main/res/layout/activity_sign_up.xml
rename to feature/src/main/res/layout/fragment_sign_up.xml
diff --git a/feature/src/main/res/navigation/nav_graph.xml b/feature/src/main/res/navigation/nav_graph.xml
index 71c194a..42369a0 100644
--- a/feature/src/main/res/navigation/nav_graph.xml
+++ b/feature/src/main/res/navigation/nav_graph.xml
@@ -15,7 +15,9 @@
             app:destination="@id/fragment_home_detail" />
         <action
             android:id="@+id/action_fragment_home_to_fragment_my_page"
-            app:destination="@id/fragment_my_page" />
+            app:destination="@id/fragment_my_page"
+            app:popUpTo="@id/fragment_home"
+            app:popUpToInclusive="true" />
     </fragment>
     <fragment
         android:id="@+id/fragment_search"
@@ -26,10 +28,23 @@
         android:id="@+id/fragment_my_page"
         android:name="com.sopt.now.feature.mypage.MyPageFragment"
         android:label="MyPageFragment"
-        tools:layout="@layout/fragment_my_page" />
+        tools:layout="@layout/fragment_my_page">
+    </fragment>
     <fragment
         android:id="@+id/fragment_home_detail"
         android:name="com.sopt.now.feature.home.HomeDetailFragment"
         android:label="HomeDetailFragment"
         tools:layout="@layout/fragment_my_page" />
+    <fragment
+        android:id="@+id/fragment_login"
+        android:name="com.sopt.now.feature.auth.LoginFragment"
+        android:label="LoginFragment"
+        tools:layout="@layout/fragment_login">
+    </fragment>
+    <fragment
+        android:id="@+id/fragment_sign_up"
+        android:name="com.sopt.now.feature.auth.SignUpFragment"
+        android:label="SignUpFragment"
+        tools:layout="@layout/fragment_sign_up">
+    </fragment>
 </navigation>