(VK_HANGUL == VK_KANA and VK_HANJA == VK_KANJI)
But They have different X11 keysym.

src/lib/platform/MSWindowsKeyState.cpp

@@ -61,11 +61,11 @@ const KeyID				MSWindowsKeyState::s_virtualKey[] =
 	/* 0x012 */ { kKeyAlt_L },		// VK_MENU
 	/* 0x013 */ { kKeyPause },		// VK_PAUSE
 	/* 0x014 */ { kKeyCapsLock },	// VK_CAPITAL
-	/* 0x015 */ { kKeyHangulKana },	// VK_HANGUL, VK_KANA
+	/* 0x015 */ { kKeyKana },		// VK_HANGUL, VK_KANA
 	/* 0x016 */ { kKeyNone },		// undefined
 	/* 0x017 */ { kKeyNone },		// VK_JUNJA
 	/* 0x018 */ { kKeyNone },		// VK_FINAL
-	/* 0x019 */ { kKeyHanjaKanzi },	// VK_KANJI
+	/* 0x019 */ { kKeyKanzi },		// VK_HANJA, VK_KANJI
 	/* 0x01a */ { kKeyNone },		// undefined
 	/* 0x01b */ { kKeyEscape },		// VK_ESCAPE
 	/* 0x01c */ { kKeyHenkan },		// VK_CONVERT		
@@ -318,11 +318,11 @@ const KeyID				MSWindowsKeyState::s_virtualKey[] =
 	/* 0x112 */ { kKeyAlt_R },		// VK_MENU
 	/* 0x113 */ { kKeyNone },		// VK_PAUSE
 	/* 0x114 */ { kKeyNone },		// VK_CAPITAL
-	/* 0x115 */ { kKeyNone },		// VK_KANA			
-	/* 0x116 */ { kKeyNone },		// VK_HANGUL		
+	/* 0x115 */ { kKeyNone },		// VK_KANA, VK_HANGUL
+	/* 0x116 */ { kKeyNone },		// undefined
 	/* 0x117 */ { kKeyNone },		// VK_JUNJA			
 	/* 0x118 */ { kKeyNone },		// VK_FINAL			
-	/* 0x119 */ { kKeyNone },		// VK_KANJI			
+	/* 0x119 */ { kKeyNone },		// VK_HANJA, VK_KANJI
 	/* 0x11a */ { kKeyNone },		// undefined
 	/* 0x11b */ { kKeyNone },		// VK_ESCAPE
 	/* 0x11c */ { kKeyNone },		// VK_CONVERT		
@@ -1339,8 +1339,19 @@ MSWindowsKeyState::setWindowGroup(SInt32 group)
 }
 
 KeyID
-MSWindowsKeyState::getKeyID(UINT virtualKey, KeyButton button)
+MSWindowsKeyState::getKeyID(UINT virtualKey, KeyButton button) const
 {
+	// VK_HANGUL == VK_KANA and VK_HANJA == VK_KANJI. (Those change IME mode)
+	// But they have different X11 keysym. So we should distinguish them.
+	if ((LOWORD(m_keyLayout) & 0xffffu) == 0x0412u) {	// 0x0412 : Korean Locale ID
+		if (virtualKey == VK_HANGUL) {
+			return kKeyHangul;
+		}
+		if (virtualKey == VK_HANJA) {
+			return kKeyHanja;
+		}
+	}
+
 	if ((button & 0x100u) != 0) {
 		virtualKey += 0x100u;
 	}
@@ -1392,3 +1403,4 @@ MSWindowsKeyState::addKeyEntry(synergy::KeyMap& keyMap, synergy::KeyMap::KeyItem
 		m_keyToVKMap[item.m_id] = static_cast<UINT>(item.m_client);
 	}
 }
+

src/lib/platform/MSWindowsKeyState.h

@@ -122,7 +122,7 @@ class MSWindowsKeyState : public KeyState {
 	(button should include the extended key bit), or kKeyNone if there is
 	no such key.
 	*/
-	static KeyID		getKeyID(UINT virtualKey, KeyButton button);
+	KeyID				getKeyID(UINT virtualKey, KeyButton button) const;
 
 	//! Map button to virtual key
 	/*!

src/lib/synergy/key_types.h

@@ -110,10 +110,12 @@ static const KeyID		kKeyScrollLock	= 0xEF14;
 static const KeyID		kKeySysReq		= 0xEF15;
 static const KeyID		kKeyEscape		= 0xEF1B;
 static const KeyID		kKeyHenkan		= 0xEF23;	/* Start/Stop Conversion */
-static const KeyID		kKeyHangulKana	= 0xEF26;	/* Hangul, Kana */
+static const KeyID		kKeyKana		= 0xEF26;	/* Kana */
 static const KeyID		kKeyHiraganaKatakana = 0xEF27;	/* Hiragana/Katakana toggle */
 static const KeyID		kKeyZenkaku		= 0xEF2A;	/* Zenkaku/Hankaku */
-static const KeyID		kKeyHanjaKanzi	= 0xEF2A;	/* Hanja, Kanzi */
+static const KeyID		kKeyKanzi		= 0xEF2A;	/* Kanzi */
+static const KeyID		kKeyHangul		= 0xEF31;	/* Hangul */
+static const KeyID		kKeyHanja		= 0xEF34;	/* Hanja */
 static const KeyID		kKeyDelete		= 0xEFFF;	/* Delete, rubout */
 
 // cursor control

src/test/integtests/platform/MSWindowsKeyStateTests.cpp

@@ -121,3 +121,24 @@ TEST_F(MSWindowsKeyStateTests, saveModifiers_noModifiers_savedModifiers0)
 	ASSERT_EQ(0, keyState.getSavedModifiers());
 	delete desks;
 }
+
+TEST_F(MSWindowsKeyStateTests, testKoreanLocale_inputModeKey_resultCorrectKeyID)
+{
+	NiceMock<MockEventQueue> eventQueue;
+	MSWindowsDesks* desks = newDesks(&eventQueue);
+	MockKeyMap keyMap;
+	MSWindowsKeyState keyState(desks, getEventTarget(), &eventQueue, keyMap);
+
+	keyState.setKeyLayout((HKL)0x00000412u);	// for ko-KR local ID
+	ASSERT_EQ(0xEF31, keyState.getKeyID(0x15u, 0x1f2u));	// VK_HANGUL from Hangul key
+	ASSERT_EQ(0xEF34, keyState.getKeyID(0x19u, 0x1f1u));	// VK_HANJA from Hanja key
+	ASSERT_EQ(0xEF31, keyState.getKeyID(0x15u, 0x11du));	// VK_HANGUL from R-Alt key
+	ASSERT_EQ(0xEF34, keyState.getKeyID(0x19u, 0x138u));	// VK_HANJA from R-Ctrl key
+
+	keyState.setKeyLayout((HKL)0x00000411); // for ja-jp locale ID
+	ASSERT_EQ(0xEF26, keyState.getKeyID(0x15u, 0x1du));	// VK_KANA
+	ASSERT_EQ(0xEF2A, keyState.getKeyID(0x19u, 0x38u));	// VK_KANJI
+
+	delete desks;
+}
+