diff --git a/app/src/main/java/org/android/go/sopt/presentation/login/LoginActivity.kt b/app/src/main/java/org/android/go/sopt/presentation/login/LoginActivity.kt
index 0c35546..b7231d2 100644
--- a/app/src/main/java/org/android/go/sopt/presentation/login/LoginActivity.kt
+++ b/app/src/main/java/org/android/go/sopt/presentation/login/LoginActivity.kt
@@ -25,12 +25,12 @@ class LoginActivity : BindingActivity<ActivityLoginBinding>(R.layout.activity_lo
         super.onCreate(savedInstanceState)
         binding.vm = viewModel
 
-        initLayout()
+        initLayoutClickListener()
         initSignupBtnClickListener()
         setupLoginState()
     }
 
-    private fun initLayout() {
+    private fun initLayoutClickListener() {
         binding.layoutLogin.setOnSingleClickListener { hideKeyboard() }
     }
 
diff --git a/app/src/main/java/org/android/go/sopt/presentation/login/LoginViewModel.kt b/app/src/main/java/org/android/go/sopt/presentation/login/LoginViewModel.kt
index ab5ea46..d3bf1cd 100644
--- a/app/src/main/java/org/android/go/sopt/presentation/login/LoginViewModel.kt
+++ b/app/src/main/java/org/android/go/sopt/presentation/login/LoginViewModel.kt
@@ -25,10 +25,10 @@ class LoginViewModel @Inject constructor(
     val pwd = MutableLiveData("")
 
     init {
-        checkAutoLogin()
+        setupAutoLogin()
     }
 
-    private fun checkAutoLogin() {
+    private fun setupAutoLogin() {
         if (authRepository.getAutoLogin() && authRepository.getSignedUpUser() != null) _loginState.value = Success
     }
 
diff --git a/app/src/main/java/org/android/go/sopt/presentation/main/MainActivity.kt b/app/src/main/java/org/android/go/sopt/presentation/main/MainActivity.kt
index 2b80fb6..7e79d74 100644
--- a/app/src/main/java/org/android/go/sopt/presentation/main/MainActivity.kt
+++ b/app/src/main/java/org/android/go/sopt/presentation/main/MainActivity.kt
@@ -18,10 +18,10 @@ class MainActivity : BindingActivity<ActivityMainBinding>(R.layout.activity_main
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        initNavigationBar()
+        initBnvItemSelectedListener()
     }
 
-    private fun initNavigationBar() {
+    private fun initBnvItemSelectedListener() {
         supportFragmentManager.findFragmentById(R.id.fcv_main_container)
             ?: navigateTo<HomeFragment>()
 
diff --git a/app/src/main/java/org/android/go/sopt/presentation/main/profile/ProfileFragment.kt b/app/src/main/java/org/android/go/sopt/presentation/main/profile/ProfileFragment.kt
index cfd63d5..a47495a 100644
--- a/app/src/main/java/org/android/go/sopt/presentation/main/profile/ProfileFragment.kt
+++ b/app/src/main/java/org/android/go/sopt/presentation/main/profile/ProfileFragment.kt
@@ -25,12 +25,17 @@ class ProfileFragment : BindingFragment<FragmentProfileBinding>(R.layout.fragmen
 
     private fun initLogoutAndLeaveBtnClickListener() {
         binding.btnProfileLogoutAndLeave.setOnSingleClickListener {
+            // TODO: show Logout And Leave Dialog
             viewModel.clearLocalPref()
             requireContext().showToast(getString(R.string.profile_logout_and_leave_msg))
-            Intent(activity, LoginActivity::class.java).apply {
-                flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
-                startActivity(this)
-            }
+            intentToLogin()
+        }
+    }
+
+    private fun intentToLogin() {
+        Intent(activity, LoginActivity::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+            startActivity(this)
         }
     }
 
diff --git a/app/src/main/java/org/android/go/sopt/presentation/signup/SignupActivity.kt b/app/src/main/java/org/android/go/sopt/presentation/signup/SignupActivity.kt
index a131516..80645b7 100644
--- a/app/src/main/java/org/android/go/sopt/presentation/signup/SignupActivity.kt
+++ b/app/src/main/java/org/android/go/sopt/presentation/signup/SignupActivity.kt
@@ -9,8 +9,8 @@ import dagger.hilt.android.AndroidEntryPoint
 import org.android.go.sopt.R
 import org.android.go.sopt.databinding.ActivitySignupBinding
 import org.android.go.sopt.presentation.login.LoginActivity
-import org.android.go.sopt.presentation.signup.SignupViewModel.Companion.INVALID_ID_CODE
-import org.android.go.sopt.presentation.signup.SignupViewModel.Companion.INVALID_PWD_CODE
+import org.android.go.sopt.presentation.signup.SignupViewModel.Companion.CODE_INVALID_ID
+import org.android.go.sopt.presentation.signup.SignupViewModel.Companion.CODE_INVALID_PWD
 import org.android.go.sopt.util.UiState.Failure
 import org.android.go.sopt.util.UiState.Success
 import org.android.go.sopt.util.binding.BindingActivity
@@ -26,11 +26,11 @@ class SignupActivity : BindingActivity<ActivitySignupBinding>(R.layout.activity_
         super.onCreate(savedInstanceState)
         binding.vm = viewModel
 
-        initLayout()
+        initLayoutClickListener()
         setupSignupState()
     }
 
-    private fun initLayout() {
+    private fun initLayoutClickListener() {
         with(binding) {
             layoutSignup.setOnSingleClickListener { hideKeyboard() }
             svSignup.setOnSingleClickListener { hideKeyboard() }
@@ -44,11 +44,11 @@ class SignupActivity : BindingActivity<ActivitySignupBinding>(R.layout.activity_
                 is Success -> intentToLogin()
                 is Failure -> {
                     when (state.code) {
-                        INVALID_ID_CODE -> showSnackbar(
+                        CODE_INVALID_ID -> showSnackbar(
                             binding.root,
                             getString(R.string.signup_invalid_id_msg),
                         )
-                        INVALID_PWD_CODE -> showSnackbar(
+                        CODE_INVALID_PWD -> showSnackbar(
                             binding.root,
                             getString(R.string.signup_invalid_pwd_msg),
                         )
diff --git a/app/src/main/java/org/android/go/sopt/presentation/signup/SignupViewModel.kt b/app/src/main/java/org/android/go/sopt/presentation/signup/SignupViewModel.kt
index 4e9de72..31b8735 100644
--- a/app/src/main/java/org/android/go/sopt/presentation/signup/SignupViewModel.kt
+++ b/app/src/main/java/org/android/go/sopt/presentation/signup/SignupViewModel.kt
@@ -35,11 +35,11 @@ class SignupViewModel @Inject constructor(
 
     fun signup() {
         if (!isValidId(id.value)) {
-            _signupState.value = Failure(INVALID_ID_CODE)
+            _signupState.value = Failure(CODE_INVALID_ID)
             return
         }
         if (!isValidPwd(pwd.value)) {
-            _signupState.value = Failure(INVALID_PWD_CODE)
+            _signupState.value = Failure(CODE_INVALID_PWD)
             return
         }
         authRepository.setSignedUpUser(getUser())
@@ -62,7 +62,7 @@ class SignupViewModel @Inject constructor(
         const val MIN_PWD_LENGTH = 8
         const val MAX_PWD_LENGTH = 12
 
-        const val INVALID_ID_CODE = 100
-        const val INVALID_PWD_CODE = 101
+        const val CODE_INVALID_ID = 100
+        const val CODE_INVALID_PWD = 101
     }
 }