diff --git a/DependencyGraph/mohanyang_dev_graph.png b/DependencyGraph/mohanyang_dev_graph.png
index 23c2ed3..dd30880 100644
Binary files a/DependencyGraph/mohanyang_dev_graph.png and b/DependencyGraph/mohanyang_dev_graph.png differ
diff --git a/DependencyGraph/mohanyang_prod_graph.png b/DependencyGraph/mohanyang_prod_graph.png
index 16d3cd4..6d6855f 100644
Binary files a/DependencyGraph/mohanyang_prod_graph.png and b/DependencyGraph/mohanyang_prod_graph.png differ
diff --git a/Plugins/DependencyPlugin/ProjectDescriptionHelpers/Module/Domain.swift b/Plugins/DependencyPlugin/ProjectDescriptionHelpers/Module/Domain.swift
index 0f5f3df..c8cdb30 100644
--- a/Plugins/DependencyPlugin/ProjectDescriptionHelpers/Module/Domain.swift
+++ b/Plugins/DependencyPlugin/ProjectDescriptionHelpers/Module/Domain.swift
@@ -13,4 +13,5 @@ public enum Domain: String, Modulable {
   case AuthService
   case PushService
   case UserService
+  case CatService
 }
diff --git a/Projects/Core/UserDefaultsClient/Interface/Keys.swift b/Projects/Core/UserDefaultsClient/Interface/Keys.swift
deleted file mode 100644
index 6aded0a..0000000
--- a/Projects/Core/UserDefaultsClient/Interface/Keys.swift
+++ /dev/null
@@ -1,14 +0,0 @@
-//
-//  Keys.swift
-//  UserDefaultsClientInterface
-//
-//  Created by 김지현 on 8/9/24.
-//  Copyright © 2024 PomoNyang. All rights reserved.
-//
-
-import Foundation
-
-public enum UserDefaultsKeys: String {
-  case isFirstInstalled = "mohanyang_userdefaults_isFirstInstalled"
-  case isOnboarded = "mohanyang_userdefaults_isOnboarded"
-}
diff --git a/Projects/Domain/CatService/Interface/API/CatAPIClientInterface.swift b/Projects/Domain/CatService/Interface/API/CatAPIClientInterface.swift
new file mode 100644
index 0000000..1164423
--- /dev/null
+++ b/Projects/Domain/CatService/Interface/API/CatAPIClientInterface.swift
@@ -0,0 +1,31 @@
+//
+//  CatServiceInterface.swift
+//  CatService
+//
+//  Created by 김지현 on 8/17/24.
+//
+
+import Foundation
+
+import APIClientInterface
+
+import Dependencies
+import DependenciesMacros
+
+
+@DependencyClient
+public struct CatService {
+  public var fetchCatLists: @Sendable (
+    _ apiClient: APIClient
+  ) async throws -> CatList
+
+  public var changeCatName: @Sendable (
+    _ apiClient: APIClient,
+    _ name: String
+  ) async throws -> Void
+}
+
+extension CatService: TestDependencyKey {
+  public static let previewValue = Self()
+  public static let testValue = Self()
+}
diff --git a/Projects/Domain/CatService/Interface/API/CatAPIRequest.swift b/Projects/Domain/CatService/Interface/API/CatAPIRequest.swift
new file mode 100644
index 0000000..90ffc32
--- /dev/null
+++ b/Projects/Domain/CatService/Interface/API/CatAPIRequest.swift
@@ -0,0 +1,46 @@
+//
+//  CatAPIRequest.swift
+//  CatServiceInterface
+//
+//  Created by 김지현 on 8/17/24.
+//  Copyright © 2024 PomoNyang. All rights reserved.
+//
+
+import Foundation
+import APIClientInterface
+
+public enum CatAPIrequest {
+  case fetchCatList, changeCatName(String)
+}
+
+extension CatAPIrequest: APIBaseRequest {
+  public var baseURL: String {
+    return API.apiBaseURL
+  }
+
+  public var path: String {
+    switch self {
+    case .fetchCatList, .changeCatName:
+      return "/api/v1/cats"
+    }
+  }
+
+  public var method: HTTPMethod {
+    switch self {
+    case .fetchCatList:
+      return .get
+    case.changeCatName:
+      return .put
+    }
+  }
+
+  public var parameters: RequestParams {
+    switch self {
+    case .fetchCatList:
+      return .requestPlain
+    case .changeCatName(let name):
+      let dto = CatDTO.Request.ChangeCatNameRequestDTO(name: name)
+      return .body(dto)
+    }
+  }
+}
diff --git a/Projects/Domain/CatService/Interface/DTO/CatDTO.swift b/Projects/Domain/CatService/Interface/DTO/CatDTO.swift
new file mode 100644
index 0000000..ebb5dea
--- /dev/null
+++ b/Projects/Domain/CatService/Interface/DTO/CatDTO.swift
@@ -0,0 +1,30 @@
+//
+//  CatDTO.swift
+//  CatServiceInterface
+//
+//  Created by 김지현 on 8/17/24.
+//  Copyright © 2024 PomoNyang. All rights reserved.
+//
+
+import Foundation
+
+public typealias CatList = [CatDTO.Response.GetCatListResponseDTO]
+
+public enum CatDTO {
+  public enum Request { }
+  public enum Response { }
+}
+
+public extension CatDTO.Request {
+  struct ChangeCatNameRequestDTO: Encodable {
+    public var name: String
+  }
+}
+
+public extension CatDTO.Response {
+  struct GetCatListResponseDTO: Equatable, Decodable {
+    public var no: Int
+    public var name: String
+    public var type: String
+  }
+}
diff --git a/Projects/Domain/CatService/Project.swift b/Projects/Domain/CatService/Project.swift
new file mode 100644
index 0000000..96668c5
--- /dev/null
+++ b/Projects/Domain/CatService/Project.swift
@@ -0,0 +1,20 @@
+import ProjectDescription
+import ProjectDescriptionHelpers
+
+@_spi(Domain)
+@_spi(Core)
+import DependencyPlugin
+
+let project: Project = .makeTMABasedProject(
+  module: Domain.CatService,
+  scripts: [],
+  targets: [
+    .sources,
+    .interface
+  ],
+  dependencies: [
+    .interface: [
+      .dependency(rootModule: Core.self)
+    ]
+  ]
+)
diff --git a/Projects/Domain/CatService/Sources/API/CatAPIClient.swift b/Projects/Domain/CatService/Sources/API/CatAPIClient.swift
new file mode 100644
index 0000000..12bfb45
--- /dev/null
+++ b/Projects/Domain/CatService/Sources/API/CatAPIClient.swift
@@ -0,0 +1,36 @@
+//
+//  CatService.swift
+//  CatService
+//
+//  Created by 김지현 on 8/17/24.
+//
+
+import Foundation
+
+import APIClientInterface
+import CatServiceInterface
+
+import Dependencies
+
+extension CatService: DependencyKey {
+  public static let liveValue: CatService = .live()
+  private static func live() -> Self {
+    return CatService(
+      fetchCatLists: { apiClient in
+        let request = CatAPIrequest.fetchCatList
+        return try await apiClient.apiRequest(
+          request: request,
+          as: CatList.self
+        )
+      },
+
+      changeCatName: { apiClient, name in
+        let request = CatAPIrequest.changeCatName(name)
+        _ = try await apiClient.apiRequest(
+          request: request,
+          as: EmptyResponse.self
+        )
+      }
+    )
+  }
+}
diff --git a/Projects/Domain/UserService/Interface/API/UserAPIClientInterface.swift b/Projects/Domain/UserService/Interface/API/UserAPIClientInterface.swift
index b65637d..62985dc 100644
--- a/Projects/Domain/UserService/Interface/API/UserAPIClientInterface.swift
+++ b/Projects/Domain/UserService/Interface/API/UserAPIClientInterface.swift
@@ -16,9 +16,6 @@ import DependenciesMacros
 
 @DependencyClient
 public struct UserService {
-  public var fetchCatLists: @Sendable (
-    _ apiClient: APIClient
-  ) async throws -> CatList
   public var selectCat: @Sendable (
     _ no: Int,
     _ apiClient: APIClient
diff --git a/Projects/Domain/UserService/Interface/API/UserAPIRequest.swift b/Projects/Domain/UserService/Interface/API/UserAPIRequest.swift
index babbc87..cabc551 100644
--- a/Projects/Domain/UserService/Interface/API/UserAPIRequest.swift
+++ b/Projects/Domain/UserService/Interface/API/UserAPIRequest.swift
@@ -10,7 +10,7 @@ import Foundation
 import APIClientInterface
 
 public enum UserAPIrequest {
-  case fetchCatList, selectCat(Int)
+  case selectCat(Int)
 }
 
 extension UserAPIrequest: APIBaseRequest {
@@ -20,8 +20,6 @@ extension UserAPIrequest: APIBaseRequest {
 
   public var path: String {
     switch self {
-    case .fetchCatList:
-      return "/api/v1/cats"
     case .selectCat:
       return "/api/v1/users/cats"
     }
@@ -29,8 +27,6 @@ extension UserAPIrequest: APIBaseRequest {
 
   public var method: HTTPMethod {
     switch self {
-    case .fetchCatList:
-      return .get
     case .selectCat:
       return .put
     }
@@ -38,8 +34,6 @@ extension UserAPIrequest: APIBaseRequest {
 
   public var parameters: RequestParams {
     switch self {
-    case .fetchCatList:
-      return .requestPlain
     case .selectCat(let no):
       let dto = UserDTO.Request.SelectCatRequestDTO(catNo: no)
       return .body(dto)
diff --git a/Projects/Domain/UserService/Interface/DTO/UserDTO.swift b/Projects/Domain/UserService/Interface/DTO/UserDTO.swift
index 24f86b2..8ffe381 100644
--- a/Projects/Domain/UserService/Interface/DTO/UserDTO.swift
+++ b/Projects/Domain/UserService/Interface/DTO/UserDTO.swift
@@ -8,8 +8,6 @@
 
 import Foundation
 
-public typealias CatList = [UserDTO.Response.GetCatListResponseDTO]
-
 public enum UserDTO {
   public enum Request { }
   public enum Response { }
@@ -22,11 +20,5 @@ public extension UserDTO.Request {
 }
 
 public extension UserDTO.Response {
-  struct GetCatListResponseDTO: Equatable, Decodable {
-    public var no: Int
-    public var name: String
-    public var type: String
-  }
 
-  struct SelectCatResponseDTO: Decodable { }
 }
diff --git a/Projects/Domain/UserService/Sources/API/UserAPIClient.swift b/Projects/Domain/UserService/Sources/API/UserAPIClient.swift
index 91077c3..414427b 100644
--- a/Projects/Domain/UserService/Sources/API/UserAPIClient.swift
+++ b/Projects/Domain/UserService/Sources/API/UserAPIClient.swift
@@ -17,13 +17,6 @@ extension UserService: DependencyKey {
   public static let liveValue: UserService = .live()
   private static func live() -> Self {
     return UserService(
-      fetchCatLists: { apiClient in
-        let request = UserAPIrequest.fetchCatList
-        return try await apiClient.apiRequest(
-          request: request,
-          as: CatList.self
-        )
-      },
       selectCat: { no, apiClient in
         let request = UserAPIrequest.selectCat(no)
         _ = try await apiClient.apiRequest(
diff --git a/Projects/Feature/Feature/Sources/AppCore.swift b/Projects/Feature/Feature/Sources/AppCore.swift
index 3cdee87..f6308ef 100644
--- a/Projects/Feature/Feature/Sources/AppCore.swift
+++ b/Projects/Feature/Feature/Sources/AppCore.swift
@@ -95,7 +95,12 @@ public struct AppCore {
 
     case .home:
       return .none
-      
+
+    case .onboarding(.selectCat(.presented(.namingCat(.presented(.moveToHome))))):
+      state.onboarding = nil
+      state.home = HomeCore.State()
+      return .none
+
     case .onboarding:
       return .none
     }
diff --git a/Projects/Feature/Feature/Sources/AppView.swift b/Projects/Feature/Feature/Sources/AppView.swift
index a899c4f..152fbd9 100644
--- a/Projects/Feature/Feature/Sources/AppView.swift
+++ b/Projects/Feature/Feature/Sources/AppView.swift
@@ -33,6 +33,7 @@ public struct AppView: View {
         Color.red
       }
     }
+    .transition(.opacity)
     .onAppear {
       store.send(.onAppear)
     }
diff --git a/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatCore.swift b/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatCore.swift
new file mode 100644
index 0000000..dc08958
--- /dev/null
+++ b/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatCore.swift
@@ -0,0 +1,91 @@
+//
+//  NamingCatCore.swift
+//  OnboardingFeature
+//
+//  Created by 김지현 on 8/17/24.
+//  Copyright © 2024 PomoNyang. All rights reserved.
+//
+
+import UserDefaultsClientInterface
+import APIClientInterface
+import CatServiceInterface
+
+import ComposableArchitecture
+
+@Reducer
+public struct NamingCatCore {
+  @ObservableState
+  public struct State: Equatable {
+    public init(selectedCat: AnyCat) {
+      self.selectedCat = selectedCat
+    }
+
+    var selectedCat: AnyCat
+    var text: String = ""
+    var inputFieldError: NamingCatError?
+    var tooltip: DownDirectionTooltip? = .init()
+  }
+  
+  public enum Action: BindableAction {
+    case onAppear
+    case tapStartButton
+    case moveToHome
+    case binding(BindingAction<State>)
+  }
+  
+  @Dependency(UserDefaultsClient.self) var userDefaultsClient
+  @Dependency(APIClient.self) var apiClient
+  @Dependency(CatService.self) var catService
+
+  public init() {}
+
+  public var body: some ReducerOf<Self> {
+    BindingReducer()
+    Reduce(self.core)
+  }
+
+  private func core(state: inout State, action: Action) -> EffectOf<Self> {
+    let isOnboardedKey = "mohanyang_userdefaults_isOnboarded"
+
+    switch action {
+    case .onAppear:
+      return .none
+
+    case .tapStartButton:
+      return .run { [text = state.text] send in
+        _ = try await catService.changeCatName(
+          apiClient: apiClient,
+          name: text
+        )
+        await userDefaultsClient.setBool(true, key: isOnboardedKey)
+        await send(.moveToHome)
+      }
+
+    case .moveToHome:
+      return .none
+
+    case .binding(\.text):
+      state.inputFieldError = setError(state.text)
+      return .none
+
+    case .binding:
+      return .none
+    }
+  }
+
+  private func setError(_ text: String) -> NamingCatError? {
+    var error: NamingCatError? = nil
+
+    if text == " " {
+      error = .startsWithWhiteSpace
+    } else if text.count > 10 {
+      error = .exceedsMaxLength
+    } else if text.containsWhitespaceOrSpecialCharacters() {
+      error = .hasSpecialCharacter
+    } else {
+      error = nil
+    }
+
+    return error
+  }
+}
diff --git a/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatError.swift b/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatError.swift
new file mode 100644
index 0000000..1d00e6b
--- /dev/null
+++ b/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatError.swift
@@ -0,0 +1,29 @@
+//
+//  NamingCatError.swift
+//  OnboardingFeature
+//
+//  Created by 김지현 on 8/17/24.
+//  Copyright © 2024 PomoNyang. All rights reserved.
+//
+
+import Foundation
+import DesignSystem
+
+enum NamingCatError {
+  case hasSpecialCharacter
+  case exceedsMaxLength
+  case startsWithWhiteSpace
+}
+
+extension NamingCatError: InputFieldErrorProtocol {
+  var message: String {
+    switch self {
+    case .hasSpecialCharacter:
+      "고양이 이름에는 공백, 특수문자가 들어갈 수 없어요"
+    case .exceedsMaxLength:
+      "고양이 이름은 10글자를 넘길 수 없어요"
+    case .startsWithWhiteSpace:
+      "고양이 이름은 빈 칸이 될 수 없어요"
+    }
+  }
+}
diff --git a/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatView.swift b/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatView.swift
new file mode 100644
index 0000000..0f239fd
--- /dev/null
+++ b/Projects/Feature/OnboardingFeature/Sources/NamingCat/NamingCatView.swift
@@ -0,0 +1,79 @@
+//
+//  NamingCatView.swift
+//  OnboardingFeature
+//
+//  Created by 김지현 on 8/17/24.
+//  Copyright © 2024 PomoNyang. All rights reserved.
+//
+
+import SwiftUI
+
+import DesignSystem
+
+import ComposableArchitecture
+
+struct NamingCatView: View {
+  @Bindable var store: StoreOf<NamingCatCore>
+  
+  init(store: StoreOf<NamingCatCore>) {
+    self.store = store
+  }
+  
+  var body: some View {
+    NavigationContainer(
+      title: Text("고양이 이름짓기"),
+      style: .navigation
+    ) {
+      VStack(spacing: 40) {
+        Spacer()
+
+        ZStack {
+          Rectangle()
+            .foregroundStyle(Alias.Color.Background.secondary)
+            .frame(height: 240)
+          store.selectedCat.catImage
+            .setTooltipTarget(tooltip: DownDirectionTooltip.self)
+        }
+
+        VStack(spacing: Alias.Spacing.small) {
+          HStack {
+            Text("내 고양이의 이름")
+              .font(Typography.subBodyR)
+              .foregroundStyle(Alias.Color.Text.secondary)
+              .padding(.leading, Alias.Spacing.xSmall)
+            Spacer()
+          }
+          InputField(
+            placeholder: store.selectedCat.name,
+            text: $store.text,
+            fieldError: $store.inputFieldError
+          )
+        }
+
+        Spacer()
+
+        Button(title: "시작하기") {
+          store.send(.tapStartButton)
+        }
+        .buttonStyle(.box(level: .primary, size: .large, width: .low))
+        .disabled(store.inputFieldError != nil || store.text == "")
+      }
+      .padding(.horizontal, 20)
+    }
+    .background {
+      Alias.Color.Background.primary
+        .ignoresSafeArea()
+    }
+    .tooltipDestination(tooltip: $store.tooltip)
+    .onAppear { store.send(.onAppear) }
+  }
+}
+
+struct DownDirectionTooltip: Tooltip {
+  var title: Text { Text("반갑다냥! 내 이름을 지어줄래냥?") }
+  var color: TooltipColor { .white }
+  var direction: TooltipDirection { .down }
+  var targetCornerRadius: CGFloat? { Alias.BorderRadius.small }
+  var dimEnabled: Bool { false }
+  var padding: CGFloat { 12 }
+}
diff --git a/Projects/Feature/OnboardingFeature/Sources/Onboarding/OnboardingView.swift b/Projects/Feature/OnboardingFeature/Sources/Onboarding/OnboardingView.swift
index bb3c87b..42243cc 100644
--- a/Projects/Feature/OnboardingFeature/Sources/Onboarding/OnboardingView.swift
+++ b/Projects/Feature/OnboardingFeature/Sources/Onboarding/OnboardingView.swift
@@ -63,7 +63,6 @@ public struct OnboardingView: View {
         Alias.Color.Background.primary
           .ignoresSafeArea()
       }
-      .onAppear { store.send(.onApear) }
       .navigationDestination(
         item: $store.scope(state: \.selectCat, action: \.selectCat)
       ) { store in
@@ -76,6 +75,7 @@ public struct OnboardingView: View {
           .onAppear { store.width = geometry.size.width }
       }
     }
+    .onAppear { store.send(.onApear) }
   }
 }
 
@@ -104,9 +104,3 @@ struct OnboardingCarouselContentView: View {
     .frame(width: width, height: 350)
   }
 }
-
-struct OnboardingView_Previews: PreviewProvider {
-  static var previews: some View {
-    OnboardingView(store: Store(initialState: OnboardingCore.State()) { OnboardingCore() })
-  }
-}
diff --git a/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatCore.swift b/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatCore.swift
index e165417..2f4f916 100644
--- a/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatCore.swift
+++ b/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatCore.swift
@@ -8,6 +8,7 @@
 
 import APIClientInterface
 import UserServiceInterface
+import CatServiceInterface
 import UserNotificationClientInterface
 import Shared
 
@@ -17,30 +18,37 @@ import ComposableArchitecture
 public struct SelectCatCore {
   @ObservableState
   public struct State: Equatable {
+    public init() { }
     var catList: [AnyCat] = []
-    //var catType: CatType? = nil
     var selectedCat: AnyCat? = nil
+    @Presents var namingCat: NamingCatCore.State?
   }
   
   public enum Action: BindableAction {
     case onAppear
     case selectCat(AnyCat)
     case tapNextButton
+    case moveToNamingCat
     case _fetchCatListRequest
     case _fetchCatListResponse(CatList)
     case _selectCatRequest
     case binding(BindingAction<State>)
+    case namingCat(PresentationAction<NamingCatCore.Action>)
   }
   
   public init() {}
 
   @Dependency(APIClient.self) var apiClient
   @Dependency(UserService.self) var userService
+  @Dependency(CatService.self) var catService
   @Dependency(UserNotificationClient.self) var userNotificationClient
 
   public var body: some ReducerOf<Self> {
     BindingReducer()
     Reduce(self.core)
+      .ifLet(\.$namingCat, action: \.namingCat) {
+        NamingCatCore()
+      }
   }
   
   private func core(state: inout State, action: Action) -> EffectOf<Self> {
@@ -55,9 +63,14 @@ public struct SelectCatCore {
     case .tapNextButton:
       return .run { send in await send(._selectCatRequest) }
 
+    case .moveToNamingCat:
+      guard let selectedCat = state.selectedCat else { return .none }
+      state.namingCat = NamingCatCore.State(selectedCat: selectedCat)
+      return .none
+
     case ._fetchCatListRequest:
       return .run { send in
-        let response = try await userService.fetchCatLists(apiClient: apiClient)
+        let response = try await catService.fetchCatLists(apiClient: apiClient)
         await send(._fetchCatListResponse(response))
       }
 
@@ -77,11 +90,14 @@ public struct SelectCatCore {
         _ = try await userService.selectCat(no: selectedCat.no, apiClient: apiClient)
         // user notification 요청
         _ = try await userNotificationClient.requestAuthorization([.alert, .badge, .sound])
-        // go to naming cat
+        await send(.moveToNamingCat)
       }
 
     case .binding:
       return .none
+
+    case .namingCat:
+      return .none
     }
   }
 }
diff --git a/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatView.swift b/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatView.swift
index 5ce48e1..a0a4e16 100644
--- a/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatView.swift
+++ b/Projects/Feature/OnboardingFeature/Sources/SelectCat/SelectCatView.swift
@@ -73,11 +73,16 @@ public struct SelectCatView: View {
       }
       .padding(.horizontal, 20)
     }
-    .onAppear { store.send(.onAppear) }
     .background {
       Alias.Color.Background.primary
         .ignoresSafeArea()
     }
+    .navigationDestination(
+      item: $store.scope(state: \.namingCat, action: \.namingCat)
+    ) { store in
+      NamingCatView(store: store)
+    }
+    .onAppear { store.send(.onAppear) }
   }
 }
 
diff --git a/Projects/Feature/SplashFeature/Sources/SplashCore.swift b/Projects/Feature/SplashFeature/Sources/SplashCore.swift
index 39b01e5..22e6e0b 100644
--- a/Projects/Feature/SplashFeature/Sources/SplashCore.swift
+++ b/Projects/Feature/SplashFeature/Sources/SplashCore.swift
@@ -34,6 +34,7 @@ public struct SplashCore {
   public init() { }
 
   let deviceIDKey =  "mohanyang_keychain_device_id"
+  let isOnboardedKey = "mohanyang_userdefaults_isOnboarded"
 
   @Dependency(APIClient.self) var apiClient
   @Dependency(AuthService.self) var authService
@@ -75,15 +76,14 @@ extension SplashCore {
       )
 
       try await Task.sleep(for: .seconds(1.5))
-
-      userDefaultsClient.boolForKey(UserDefaultsKeys.isOnboarded.rawValue) ?
+      userDefaultsClient.boolForKey(isOnboardedKey) ?
       await send(.moveToHome) : await send(.moveToOnboarding)
     }
   }
 
   private func getDeviceUUID() -> String {
     guard let uuid = UIDevice.current.identifierForVendor?.uuidString,
-          keychainClient.create(key: "mohanyang_keychain_device_id", data: uuid) else {
+          keychainClient.create(key: deviceIDKey, data: uuid) else {
       return ""
     }
     return uuid
diff --git a/Projects/Shared/DesignSystem/Sources/Component/InputField/InputField.swift b/Projects/Shared/DesignSystem/Sources/Component/InputField/InputField.swift
index c51f2e2..53e36d9 100644
--- a/Projects/Shared/DesignSystem/Sources/Component/InputField/InputField.swift
+++ b/Projects/Shared/DesignSystem/Sources/Component/InputField/InputField.swift
@@ -27,7 +27,6 @@ public struct InputField<T: InputFieldErrorProtocol>: View {
     self._fieldError = fieldError
   }
 
-  // MARK: Placeholder Color를 TextFieldStyle 내부에서 변경하는 방법 Plz...
   public var body: some View {
     VStack(spacing: Alias.Spacing.small) {
       TextField(
diff --git a/Projects/Shared/Utils/Sources/Extensions/String+Extension.swift b/Projects/Shared/Utils/Sources/Extensions/String+Extension.swift
index 9bdffa2..75b0acf 100644
--- a/Projects/Shared/Utils/Sources/Extensions/String+Extension.swift
+++ b/Projects/Shared/Utils/Sources/Extensions/String+Extension.swift
@@ -19,4 +19,11 @@ extension String {
       .joined()
     return camelCased
   }
+
+  public func containsWhitespaceOrSpecialCharacters() -> Bool {
+    let pattern = "[^a-zA-Z0-9가-힣ㄱ-ㅎㅏ-ㅣ]"
+    let regex = try! NSRegularExpression(pattern: pattern)
+    let range = NSRange(location: 0, length: self.utf16.count)
+    return regex.firstMatch(in: self, options: [], range: range) != nil
+  }
 }