diff --git a/Packages/OpenVanilla_Voltaire/Sources/Voltaire/CtlCandidateUniversal.swift b/Packages/OpenVanilla_Voltaire/Sources/Voltaire/CtlCandidateUniversal.swift
index ae5b6ddc..858d215f 100644
--- a/Packages/OpenVanilla_Voltaire/Sources/Voltaire/CtlCandidateUniversal.swift
+++ b/Packages/OpenVanilla_Voltaire/Sources/Voltaire/CtlCandidateUniversal.swift
@@ -433,7 +433,7 @@ public class CtlCandidateUniversal: CtlCandidate {
   @discardableResult override public func highlightNextCandidate() -> Bool {
     guard let delegate = delegate else { return false }
     selectedCandidateIndex =
-      (selectedCandidateIndex + 1 >= delegate.candidateCountForController(self))
+      (selectedCandidateIndex + 1 >= delegate.candidatePairs().count)
       ? 0 : selectedCandidateIndex + 1
     return true
   }
@@ -442,7 +442,7 @@ public class CtlCandidateUniversal: CtlCandidate {
     guard let delegate = delegate else { return false }
     selectedCandidateIndex =
       (selectedCandidateIndex == 0)
-      ? delegate.candidateCountForController(self) - 1 : selectedCandidateIndex - 1
+      ? delegate.candidatePairs().count - 1 : selectedCandidateIndex - 1
     return true
   }
 
@@ -452,7 +452,7 @@ public class CtlCandidateUniversal: CtlCandidate {
     }
 
     let result = currentPageIndex * keyLabels.count + index
-    return result < delegate.candidateCountForController(self) ? result : Int.max
+    return result < delegate.candidatePairs().count ? result : Int.max
   }
 
   override public var selectedCandidateIndex: Int {
@@ -464,7 +464,7 @@ public class CtlCandidateUniversal: CtlCandidate {
         return
       }
       let keyLabelCount = keyLabels.count
-      if newValue < delegate.candidateCountForController(self) {
+      if newValue < delegate.candidatePairs().count {
         currentPageIndex = newValue / keyLabelCount
         candidateView.highlightedIndex = newValue % keyLabelCount
         layoutCandidateView()
@@ -478,7 +478,7 @@ extension CtlCandidateUniversal {
     guard let delegate = delegate else {
       return 0
     }
-    let totalCount = delegate.candidateCountForController(self)
+    let totalCount = delegate.candidatePairs().count
     let keyLabelCount = keyLabels.count
     return totalCount / keyLabelCount + ((totalCount % keyLabelCount) != 0 ? 1 : 0)
   }
@@ -487,7 +487,7 @@ extension CtlCandidateUniversal {
     guard let delegate = delegate else {
       return 0
     }
-    let totalCount = delegate.candidateCountForController(self)
+    let totalCount = delegate.candidatePairs().count
     let keyLabelCount = keyLabels.count
     return totalCount % keyLabelCount
   }
@@ -497,12 +497,12 @@ extension CtlCandidateUniversal {
 
     candidateView.set(keyLabelFont: keyLabelFont, candidateFont: candidateFont)
     var candidates = [(String, String)]()
-    let count = delegate.candidateCountForController(self)
+    let count = delegate.candidatePairs().count
     let keyLabelCount = keyLabels.count
 
     let begin = currentPageIndex * keyLabelCount
     for index in begin..<min(begin + keyLabelCount, count) {
-      let candidate = delegate.ctlCandidate(self, candidateAtIndex: index)
+      let candidate = delegate.candidatePairAt(index)
       candidates.append(candidate)
     }
     candidateView.set(
@@ -591,6 +591,6 @@ extension CtlCandidateUniversal {
   }
 
   @objc private func candidateViewMouseDidClick(_: Any) {
-    delegate?.candidateSelected(at: selectedCandidateIndex)
+    delegate?.candidatePairSelected(at: selectedCandidateIndex)
   }
 }
diff --git a/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift b/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift
index 64f3ac52..f7ab9800 100644
--- a/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift
+++ b/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift
@@ -9,11 +9,9 @@
 import Cocoa
 
 public protocol CtlCandidateDelegate: AnyObject {
-  func candidateCountForController(_ controller: CtlCandidateProtocol) -> Int
-  func candidatesForController(_ controller: CtlCandidateProtocol) -> [(String, String)]
-  func ctlCandidate(_ controller: CtlCandidateProtocol, candidateAtIndex index: Int)
-    -> (String, String)
-  func candidateSelected(at index: Int)
+  func candidatePairs() -> [(String, String)]
+  func candidatePairAt(_ index: Int) -> (String, String)
+  func candidatePairSelected(at index: Int)
   func buzz()
   func kanjiConversionIfRequired(_ target: String) -> String
 }
diff --git a/Source/Modules/KeyHandler_Core.swift b/Source/Modules/KeyHandler_Core.swift
index f4788c1d..4145ba92 100644
--- a/Source/Modules/KeyHandler_Core.swift
+++ b/Source/Modules/KeyHandler_Core.swift
@@ -20,7 +20,7 @@ import Tekkon
 /// KeyHandler 委任協定
 public protocol KeyHandlerDelegate {
   var clientBundleIdentifier: String { get }
-  func ctlCandidate() -> CtlCandidateProtocol
+  func candidateController() -> CtlCandidateProtocol
   func candidateSelectionCalledByKeyHandler(at index: Int)
   func performUserPhraseOperation(with state: IMEStateProtocol, addToFilter: Bool)
     -> Bool
diff --git a/Source/Modules/KeyHandler_HandleCandidate.swift b/Source/Modules/KeyHandler_HandleCandidate.swift
index 86671c68..b449d2bc 100644
--- a/Source/Modules/KeyHandler_HandleCandidate.swift
+++ b/Source/Modules/KeyHandler_HandleCandidate.swift
@@ -26,7 +26,7 @@ extension KeyHandler {
     stateCallback: @escaping (IMEStateProtocol) -> Void,
     errorCallback: @escaping (String) -> Void
   ) -> Bool {
-    guard var ctlCandidate = delegate?.ctlCandidate() else {
+    guard var ctlCandidate = delegate?.candidateController() else {
       errorCallback("06661F6E")
       return true
     }
diff --git a/Source/Modules/SessionCtl_Delegates.swift b/Source/Modules/SessionCtl_Delegates.swift
index fa67af69..66ad9022 100644
--- a/Source/Modules/SessionCtl_Delegates.swift
+++ b/Source/Modules/SessionCtl_Delegates.swift
@@ -18,25 +18,23 @@ extension SessionCtl: KeyHandlerDelegate {
     return client.bundleIdentifier() ?? ""
   }
 
-  func ctlCandidate() -> CtlCandidateProtocol { Self.ctlCandidateCurrent }
+  func candidateController() -> CtlCandidateProtocol { Self.ctlCandidateCurrent }
 
   func candidateSelectionCalledByKeyHandler(at index: Int) {
-    candidateSelected(at: index)
+    candidatePairSelected(at: index)
   }
 
   func performUserPhraseOperation(with state: IMEStateProtocol, addToFilter: Bool)
     -> Bool
   {
     guard state.type == .ofMarking else { return false }
-    let refInputModeReversed: Shared.InputMode =
-      (inputMode == .imeModeCHT) ? .imeModeCHS : .imeModeCHT
     if !LMMgr.writeUserPhrase(
       state.data.userPhraseDumped, inputMode: inputMode,
       areWeDuplicating: state.data.doesUserPhraseExist,
       areWeDeleting: addToFilter
     )
       || !LMMgr.writeUserPhrase(
-        state.data.userPhraseDumpedConverted, inputMode: refInputModeReversed,
+        state.data.userPhraseDumpedConverted, inputMode: inputMode.reversed,
         areWeDuplicating: false,
         areWeDeleting: addToFilter
       )
@@ -58,36 +56,18 @@ extension SessionCtl: CtlCandidateDelegate {
     ChineseConverter.kanjiConversionIfRequired(target)
   }
 
-  func candidateCountForController(_ controller: CtlCandidateProtocol) -> Int {
-    _ = controller  // 防止格式整理工具毀掉與此對應的參數。
-    if state.isCandidateContainer {
-      return state.candidates.count
-    }
-    return 0
+  func candidatePairs() -> [(String, String)] {
+    state.isCandidateContainer ? state.candidates : []
   }
 
-  /// 直接給出全部的候選字詞的字音配對陣列
-  /// - Parameter controller: 對應的控制器。因為有唯一解，所以填錯了也不會有影響。
-  /// - Returns: 候選字詞陣列（字音配對）。
-  func candidatesForController(_ controller: CtlCandidateProtocol) -> [(String, String)] {
-    _ = controller  // 防止格式整理工具毀掉與此對應的參數。
-    if state.isCandidateContainer {
-      return state.candidates
-    }
-    return .init()
-  }
-
-  func ctlCandidate(_ controller: CtlCandidateProtocol, candidateAtIndex index: Int)
-    -> (String, String)
-  {
-    _ = controller  // 防止格式整理工具毀掉與此對應的參數。
-    if state.isCandidateContainer {
+  func candidatePairAt(_ index: Int) -> (String, String) {
+    if state.isCandidateContainer, state.candidates.count > index {
       return state.candidates[index]
     }
     return ("", "")
   }
 
-  func candidateSelected(at index: Int) {
+  func candidatePairSelected(at index: Int) {
     if state.type == .ofSymbolTable, (0..<state.node.members.count).contains(index) {
       let node = state.node.members[index]
       if !node.members.isEmpty {
diff --git a/Source/Modules/SessionCtl_IMKCandidatesData.swift b/Source/Modules/SessionCtl_IMKCandidatesData.swift
index 3c911b08..066847c3 100644
--- a/Source/Modules/SessionCtl_IMKCandidatesData.swift
+++ b/Source/Modules/SessionCtl_IMKCandidatesData.swift
@@ -124,6 +124,6 @@ extension SessionCtl {
         handleIMKCandidatesSelected(state.candidates)
       }
     }
-    candidateSelected(at: indexDeducted)
+    candidatePairSelected(at: indexDeducted)
   }
 }
diff --git a/Source/Modules/UIModules/CandidateUI/IMKCandidatesImpl.swift b/Source/Modules/UIModules/CandidateUI/IMKCandidatesImpl.swift
index e44d2e84..40dce0b2 100644
--- a/Source/Modules/UIModules/CandidateUI/IMKCandidatesImpl.swift
+++ b/Source/Modules/UIModules/CandidateUI/IMKCandidatesImpl.swift
@@ -115,7 +115,7 @@ public class CtlCandidateIMK: IMKCandidates, CtlCandidateProtocol {
 
   private var pageCount: Int {
     guard let delegate = delegate else { return 0 }
-    let totalCount = delegate.candidateCountForController(self)
+    let totalCount = delegate.candidatePairs().count
     let keyLabelCount = keyLabels.count
     return totalCount / keyLabelCount + ((totalCount % keyLabelCount) != 0 ? 1 : 0)
   }
@@ -147,7 +147,7 @@ public class CtlCandidateIMK: IMKCandidates, CtlCandidateProtocol {
   public func candidateIndexAtKeyLabelIndex(_ index: Int) -> Int {
     guard let delegate = delegate else { return Int.max }
     let result = currentPageIndex * keyLabels.count + index
-    return result < delegate.candidateCountForController(self) ? result : Int.max
+    return result < delegate.candidatePairs().count ? result : Int.max
   }
 
   public var selectedCandidateIndex: Int {