diff --git a/Source/Modules/IMEState.swift b/Source/Modules/IMEState.swift
index aee24f70..eec9530c 100644
--- a/Source/Modules/IMEState.swift
+++ b/Source/Modules/IMEState.swift
@@ -33,6 +33,7 @@ public protocol IMEStateProtocol {
   var hasComposition: Bool { get }
   var isCandidateContainer: Bool { get }
   var displayedText: String { get }
+  var displayedTextConverted: String { get }
   var textToCommit: String { get set }
   var tooltip: String { get set }
   var attributedString: NSAttributedString { get }
@@ -40,10 +41,12 @@ public protocol IMEStateProtocol {
   var isFilterable: Bool { get }
   var isMarkedLengthValid: Bool { get }
   var node: CandidateNode { get set }
-  var cursor: Int { get }
   var displayTextSegments: [String] { get }
   var tooltipBackupForInputting: String { get set }
   var markedRange: Range<Int> { get }
+  var cursor: Int { get }
+  var u16MarkedRange: Range<Int> { get }
+  var u16Cursor: Int { get }
 }
 
 /// 用以呈現輸入法控制器（ctlInputMethod）的各種狀態。
@@ -174,9 +177,12 @@ extension IMEState {
   public var isMarkedLengthValid: Bool { data.isMarkedLengthValid }
   public var candidates: [(String, String)] { data.candidates }
   public var displayedText: String { data.displayedText }
+  public var displayedTextConverted: String { data.displayedTextConverted }
   public var cursor: Int { data.cursor }
   public var displayTextSegments: [String] { data.displayTextSegments }
   public var markedRange: Range<Int> { data.markedRange }
+  public var u16MarkedRange: Range<Int> { data.u16MarkedRange }
+  public var u16Cursor: Int { data.u16Cursor }
   public var convertedToInputting: IMEState {
     if type == .ofInputting { return self }
     var result = IMEState.ofInputting(displayTextSegments: data.displayTextSegments, cursor: data.cursor)
diff --git a/Source/Modules/UIModules/PopupCompositionBufferUI/ctlPopupCompositionBuffer.swift b/Source/Modules/UIModules/PopupCompositionBufferUI/ctlPopupCompositionBuffer.swift
index 6e2376cc..8b2a4526 100644
--- a/Source/Modules/UIModules/PopupCompositionBufferUI/ctlPopupCompositionBuffer.swift
+++ b/Source/Modules/UIModules/PopupCompositionBufferUI/ctlPopupCompositionBuffer.swift
@@ -58,7 +58,7 @@ public class ctlPopupCompositionBuffer: NSWindowController {
       return
     }
 
-    let attrString: NSMutableAttributedString = .init(string: state.data.displayedTextConverted)
+    let attrString: NSMutableAttributedString = .init(string: state.displayedTextConverted)
     let verticalAttributes: [NSAttributedString.Key: Any] = [
       .verticalGlyphForm: true,
       .paragraphStyle: {
@@ -95,8 +95,8 @@ public class ctlPopupCompositionBuffer: NSWindowController {
     attrString.setAttributes(
       markerAttributes,
       range: NSRange(
-        location: state.data.u16MarkedRange.lowerBound,
-        length: state.data.u16MarkedRange.upperBound - state.data.u16MarkedRange.lowerBound
+        location: state.u16MarkedRange.lowerBound,
+        length: state.u16MarkedRange.upperBound - state.u16MarkedRange.lowerBound
       )
     )
 
@@ -123,12 +123,12 @@ public class ctlPopupCompositionBuffer: NSWindowController {
       isTypingDirectionVertical
       ? NSMutableAttributedString(string: "▔", attributes: cursorAttributes)
       : NSMutableAttributedString(string: "_", attributes: cursorAttributes)
-    attrString.insert(attrCursor, at: state.data.u16Cursor)
+    attrString.insert(attrCursor, at: state.u16Cursor)
 
     textShown = attrString
     messageTextField.maximumNumberOfLines = 1
     if let editor = messageTextField.currentEditor() {
-      editor.selectedRange = NSRange(state.data.u16MarkedRange)
+      editor.selectedRange = NSRange(state.u16MarkedRange)
     }
     window?.orderFront(nil)
     set(windowOrigin: point)
diff --git a/Source/Modules/ctlInputMethod_HandleDisplay.swift b/Source/Modules/ctlInputMethod_HandleDisplay.swift
index 4be773bd..bd7246d9 100644
--- a/Source/Modules/ctlInputMethod_HandleDisplay.swift
+++ b/Source/Modules/ctlInputMethod_HandleDisplay.swift
@@ -20,7 +20,7 @@ extension ctlInputMethod {
   var attributedStringSecured: (NSAttributedString, NSRange) {
     PrefMgr.shared.clientsIMKTextInputIncapable.contains(clientBundleIdentifier)
       ? (state.data.attributedStringPlaceholder, NSRange(location: 0, length: 0))
-      : (state.attributedString, NSRange(state.data.u16MarkedRange))
+      : (state.attributedString, NSRange(state.u16MarkedRange))
   }
 
   func lineHeightRect(zeroCursor: Bool = false) -> NSRect {
@@ -28,14 +28,10 @@ extension ctlInputMethod {
     guard let client = client() else {
       return lineHeightRect
     }
-    var u16Cursor: Int = {
-      // iMessage 在 cursor == 0 時的計算會有一些偏差，所以例外處理。
-      if clientBundleIdentifier == "com.apple.MobileSMS" { return state.data.u16Cursor }
-      if state.data.marker >= state.data.cursor { return state.data.u16Cursor }
-      return state.data.u16Marker  // 這樣可以讓工具提示視窗始終盡量往書寫方向的後方顯示。
-    }()
-    u16Cursor = max(min(state.data.displayedTextConverted.utf16.count, u16Cursor), 0)
+    var u16Cursor: Int = state.u16MarkedRange.lowerBound
+    u16Cursor = max(min(state.displayedTextConverted.utf16.count, u16Cursor), 0)
     if zeroCursor { u16Cursor = 0 }
+    // iMessage 的話，據此算出來的 lineHeightRect 結果的橫向座標起始點不準確。目前無解。
     while lineHeightRect.origin.x == 0, lineHeightRect.origin.y == 0, u16Cursor >= 0 {
       client.attributes(
         forCharacterIndex: u16Cursor, lineHeightRectangle: &lineHeightRect