diff --git a/Source/Modules/ControllerModules/InputState.swift b/Source/Modules/ControllerModules/InputState.swift
index 2516b1d6..943c3db1 100644
--- a/Source/Modules/ControllerModules/InputState.swift
+++ b/Source/Modules/ControllerModules/InputState.swift
@@ -174,24 +174,34 @@ public enum InputState {
     init(composingBuffer: String, cursorIndex: Int, reading: String = "", nodeValuesArray: [String] = []) {
       self.composingBuffer = composingBuffer
       self.reading = reading
-      self.nodeValuesArray = nodeValuesArray
+      // 為了簡化運算，將 reading 本身也變成一個字詞節點。
+      if !reading.isEmpty {
+        var newNodeValuesArray = [String]()
+        var temporaryNode = ""
+        var charCounter = 0
+        for node in nodeValuesArray {
+          for char in node {
+            if charCounter == cursorIndex - reading.utf16.count {
+              newNodeValuesArray.append(temporaryNode)
+              temporaryNode = ""
+              newNodeValuesArray.append(reading)
+            }
+            temporaryNode += String(char)
+            charCounter += 1
+          }
+          newNodeValuesArray.append(temporaryNode)
+          temporaryNode = ""
+        }
+        self.nodeValuesArray = newNodeValuesArray
+      } else {
+        self.nodeValuesArray = nodeValuesArray
+      }
       defer { self.cursorIndex = cursorIndex }
     }
 
     var attributedString: NSMutableAttributedString {
       /// 考慮到因為滑鼠點擊等其它行為導致的組字區內容遞交情況，
       /// 這裡對組字區內容也加上康熙字轉換或者 JIS 漢字轉換處理。
-      guard reading.isEmpty else {
-        let attributedString = NSMutableAttributedString(
-          string: composingBufferConverted,
-          attributes: [
-            /// 不能用 .thick，否則會看不到游標。
-            .underlineStyle: NSUnderlineStyle.single.rawValue,
-            .markedClauseSegment: 0,
-          ]
-        )
-        return attributedString
-      }
       let attributedString = NSMutableAttributedString(string: composingBufferConverted)
       var newBegin = 0
       for (i, neta) in nodeValuesArray.enumerated() {