diff --git a/Source/Modules/ControllerModules/KeyHandler.h b/Source/Modules/ControllerModules/KeyHandler.h
index dd45b041..020bad09 100644
--- a/Source/Modules/ControllerModules/KeyHandler.h
+++ b/Source/Modules/ControllerModules/KeyHandler.h
@@ -74,6 +74,7 @@ struct BufferStatePackage
 - (BOOL)isPrintable:(UniChar)charCode;
 - (NSArray<NSString *> *)buildAssociatePhraseArrayWithKey:(NSString *)key;
 - (NSArray<NSString *> *)getCandidatesArray;
+- (NSInteger)getKeyLengthAtIndexZero;
 - (NSInteger)getBuilderCursorIndex;
 - (NSInteger)getBuilderLength;
 - (NSInteger)getPackagedCursorIndex;
diff --git a/Source/Modules/ControllerModules/KeyHandler.mm b/Source/Modules/ControllerModules/KeyHandler.mm
index c9be6c67..97eb3053 100644
--- a/Source/Modules/ControllerModules/KeyHandler.mm
+++ b/Source/Modules/ControllerModules/KeyHandler.mm
@@ -623,6 +623,11 @@ static NSString *const kGraphVizOutputfile = @"/tmp/vChewing-visualization.dot";
     return candidatesArray;
 }
 
+- (NSInteger)getKeyLengthAtIndexZero
+{
+    return [NSString stringWithUTF8String:_walkedNodes[0].node->currentKeyValue().value.c_str()].length;
+}
+
 #pragma mark - 威注音認為有必要單獨拿出來處理的部分，交給 Swift 則有些困難。
 
 - (BOOL)isPrintable:(UniChar)charCode
diff --git a/Source/Modules/ControllerModules/KeyHandler_Misc.swift b/Source/Modules/ControllerModules/KeyHandler_Misc.swift
index b215d86b..0421a562 100644
--- a/Source/Modules/ControllerModules/KeyHandler_Misc.swift
+++ b/Source/Modules/ControllerModules/KeyHandler_Misc.swift
@@ -41,7 +41,11 @@ import Cocoa
 			&& (cursorIndex < getBuilderLength()))
 			|| cursorIndex == 0
 		{
-			cursorIndex += 1
+			if cursorIndex == 0 && !mgrPrefs.setRearCursorMode {
+				cursorIndex += getKeyLengthAtIndexZero()
+			} else {
+				cursorIndex += 1
+			}
 		}
 		return cursorIndex
 	}