diff --git a/Source/Modules/ControllerModules/InputSignal.swift b/Source/Modules/ControllerModules/InputSignal.swift
index 3462f0e9..61aea850 100644
--- a/Source/Modules/ControllerModules/InputSignal.swift
+++ b/Source/Modules/ControllerModules/InputSignal.swift
@@ -137,12 +137,10 @@ struct InputSignal: CustomStringConvertible {
   private(set) var keyCode: UInt16
   private var isFlagChanged: Bool
   private var flags: NSEvent.ModifierFlags
-  private var cursorForwardKey: KeyCode = .kNone
-  private var cursorBackwardKey: KeyCode = .kNone
-  private var extraChooseCandidateKey: KeyCode = .kNone
-  private var extraChooseCandidateKeyReverse: KeyCode = .kNone
-  private var absorbedArrowKey: KeyCode = .kNone
-  private var verticalTypingCandidateKey: KeyCode = .kNone
+  private var cursorForwardKey: KeyCode = .kNone  // 12 o'clock
+  private var cursorBackwardKey: KeyCode = .kNone  // 6 o'clock
+  private var cursorKeyClockRight: KeyCode = .kNone  // 3 o'clock
+  private var cursorKeyClockLeft: KeyCode = .kNone  // 9 o'clock
   private(set) var emacsKey: EmacsKey
 
   public init(
@@ -191,14 +189,25 @@ struct InputSignal: CustomStringConvertible {
   mutating func defineArrowKeys() {
     cursorForwardKey = isTypingVertical ? .kDownArrow : .kRightArrow
     cursorBackwardKey = isTypingVertical ? .kUpArrow : .kLeftArrow
-    extraChooseCandidateKey = isTypingVertical ? .kLeftArrow : .kDownArrow
-    extraChooseCandidateKeyReverse = isTypingVertical ? .kRightArrow : .kUpArrow
-    absorbedArrowKey = isTypingVertical ? .kRightArrow : .kUpArrow
-    verticalTypingCandidateKey = isTypingVertical ? absorbedArrowKey : .kNone
+    cursorKeyClockLeft = isTypingVertical ? .kRightArrow : .kUpArrow
+    cursorKeyClockRight = isTypingVertical ? .kLeftArrow : .kDownArrow
   }
 
   var description: String {
-    "<inputText:\(String(describing: inputText)), inputTextIgnoringModifiers:\(String(describing: inputTextIgnoringModifiers)) charCode:\(charCode), keyCode:\(keyCode), flags:\(flags), cursorForwardKey:\(cursorForwardKey), cursorBackwardKey:\(cursorBackwardKey), extraChooseCandidateKey:\(extraChooseCandidateKey), extraChooseCandidateKeyReverse:\(extraChooseCandidateKeyReverse), absorbedArrowKey:\(absorbedArrowKey),  verticalTypingCandidateKey:\(verticalTypingCandidateKey), emacsKey:\(emacsKey), isTypingVertical:\(isTypingVertical)>"
+    var result = "<[InputSignal] "
+    result += "inputText:\(String(describing: inputText)), "
+    result += "inputTextIgnoringModifiers:\(String(describing: inputTextIgnoringModifiers)), "
+    result += "charCode:\(charCode), "
+    result += "keyCode:\(keyCode), "
+    result += "flags:\(flags), "
+    result += "cursorForwardKey:\(cursorForwardKey), "
+    result += "cursorBackwardKey:\(cursorBackwardKey), "
+    result += "cursorKeyClockRight:\(cursorKeyClockRight), "
+    result += "cursorKeyClockLeft:\(cursorKeyClockLeft), "
+    result += "emacsKey:\(emacsKey), "
+    result += "isTypingVertical:\(isTypingVertical)"
+    result += ">"
+    return result
   }
 
   // 除了 ANSI charCode 以外，其餘一律過濾掉，免得純 Swift 版 KeyHandler 被餵屎。
@@ -248,10 +257,8 @@ struct InputSignal: CustomStringConvertible {
   var isDelete: Bool { KeyCode(rawValue: keyCode) == KeyCode.kWindowsDelete }
   var isCursorBackward: Bool { KeyCode(rawValue: keyCode) == cursorBackwardKey }
   var isCursorForward: Bool { KeyCode(rawValue: keyCode) == cursorForwardKey }
-  var isAbsorbedArrowKey: Bool { KeyCode(rawValue: keyCode) == absorbedArrowKey }
-  var isExtraChooseCandidateKey: Bool { KeyCode(rawValue: keyCode) == extraChooseCandidateKey }
-  var isExtraChooseCandidateKeyReverse: Bool { KeyCode(rawValue: keyCode) == extraChooseCandidateKeyReverse }
-  var isVerticalTypingCandidateKey: Bool { KeyCode(rawValue: keyCode) == verticalTypingCandidateKey }
+  var isCursorClockRight: Bool { KeyCode(rawValue: keyCode) == cursorKeyClockRight }
+  var isCursorClockLeft: Bool { KeyCode(rawValue: keyCode) == cursorKeyClockLeft }
 
   // 這裡必須加上「flags == .shift」，否則會出現某些情況下輸入法「誤判當前鍵入的非 Shift 字符為大寫」的問題。
   var isUpperCaseASCIILetterKey: Bool { (65...90).contains(charCode) && flags == .shift }
diff --git a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
index 3b35f77f..0793cab1 100644
--- a/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_HandleInput.swift
@@ -78,8 +78,9 @@ extension KeyHandler {
     /// 這裡的處理原先是給威注音曾經有過的 Shift 切換英數模式來用的，但因為採 Chromium 核
     /// 心的瀏覽器會讓 IMK 無法徹底攔截對 Shift 鍵的單擊行為、導致這個模式的使用體驗非常糟
     /// 糕，故僅保留以 Caps Lock 驅動的英數模式。
-    if input.isBackSpace || input.isEnter || input.isAbsorbedArrowKey || input.isExtraChooseCandidateKey
-      || input.isExtraChooseCandidateKeyReverse || input.isCursorForward || input.isCursorBackward
+    if input.isBackSpace || input.isEnter
+      || input.isCursorClockLeft || input.isCursorClockRight
+      || input.isCursorForward || input.isCursorBackward
     {
       // 略過對 BackSpace 的處理。
     } else if input.isCapsLockOn {
@@ -265,9 +266,8 @@ extension KeyHandler {
     // MARK: 用上下左右鍵呼叫選字窗 (Calling candidate window using Up / Down or PageUp / PageDn.)
 
     if let currentState = state as? InputState.NotEmpty, composer.isEmpty, !input.isOptionHold,
-      input.isExtraChooseCandidateKey || input.isExtraChooseCandidateKeyReverse || input.isSpace
+      input.isCursorClockLeft || input.isCursorClockRight || input.isSpace
         || input.isPageDown || input.isPageUp || (input.isTab && mgrPrefs.specifyShiftTabKeyBehavior)
-        || (input.isTypingVertical && (input.isVerticalTypingCandidateKey))
     {
       if input.isSpace {
         /// 倘若沒有在偏好設定內將 Space 空格鍵設為選字窗呼叫用鍵的話………
@@ -353,22 +353,22 @@ extension KeyHandler {
       return handleEnd(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
     }
 
-    // MARK: AbsorbedArrowKey
+    // MARK: Clock-Left & Clock-Right
 
-    if input.isAbsorbedArrowKey || input.isExtraChooseCandidateKey || input.isExtraChooseCandidateKeyReverse {
+    if input.isCursorClockLeft || input.isCursorClockRight {
       if input.isOptionHold, state is InputState.Inputting {
-        if input.isExtraChooseCandidateKey {
+        if input.isCursorClockRight {
           return handleInlineCandidateRotation(
             state: state, reverseModifier: false, stateCallback: stateCallback, errorCallback: errorCallback
           )
         }
-        if input.isExtraChooseCandidateKeyReverse {
+        if input.isCursorClockLeft {
           return handleInlineCandidateRotation(
             state: state, reverseModifier: true, stateCallback: stateCallback, errorCallback: errorCallback
           )
         }
       }
-      return handleAbsorbedArrowKey(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
+      return handleClockKey(state: state, stateCallback: stateCallback, errorCallback: errorCallback)
     }
 
     // MARK: Backspace
diff --git a/Source/Modules/ControllerModules/KeyHandler_States.swift b/Source/Modules/ControllerModules/KeyHandler_States.swift
index 4bd97370..04bf65c0 100644
--- a/Source/Modules/ControllerModules/KeyHandler_States.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_States.swift
@@ -509,7 +509,7 @@ extension KeyHandler {
   ///   - stateCallback: 狀態回呼。
   ///   - errorCallback: 錯誤回呼。
   /// - Returns: 將按鍵行為「是否有處理掉」藉由 ctlInputMethod 回報給 IMK。
-  func handleAbsorbedArrowKey(
+  func handleClockKey(
     state: InputStateProtocol,
     stateCallback: @escaping (InputStateProtocol) -> Void,
     errorCallback: @escaping () -> Void