diff --git a/src/game/lib/realtime_stage_timer.js b/src/game/lib/realtime_stage_timer.js
index 043a3fd..685ccd1 100644
--- a/src/game/lib/realtime_stage_timer.js
+++ b/src/game/lib/realtime_stage_timer.js
@@ -1,11 +1,13 @@
-function RealtimeStageTimer(timeLimitMS) {
-	this.timeLimit = timeLimitMS;
+function RealtimeStageTimer(timeLimitSec) {
+	this.timeLimit = timeLimitSec;
 
 	this.startTime = 0;
 	this.elapsedTime = 0;
+	this.isStarted = false;
 	this.isPaused = true;
 
 	this.onTimeUpdate = null;
+	this.onTimeOver = null;
 
 	this.timerEvent = null;
 }
@@ -14,7 +16,14 @@ RealtimeStageTimer.prototype.setTimeUpdateEvent = function(eventMethod) {
 	this.onTimeUpdate = eventMethod;
 }
 
+RealtimeStageTimer.prototype.setTimeOverEvent = function(eventMethod) {
+	this.onTimeOver = eventMethod;
+}
+
 RealtimeStageTimer.prototype.start = function() {
+	if(this.isStarted === true)
+		return;
+
 	this.isPaused = false;
 	this.startTime = game.time.totalElapsedSeconds();
 
@@ -27,13 +36,22 @@ RealtimeStageTimer.prototype.start = function() {
 
 RealtimeStageTimer.prototype.pause = function() {
 	this.isPaused = true;
+
+	this.sendElapsedTime();
 }
 
 RealtimeStageTimer.prototype.resume = function() {
 	this.isPaused = false;
+
+	this.sendElapsedTime();
 }
 
 RealtimeStageTimer.prototype.stop = function() {
+	this.isStarted = false;
+	this.isPaused = true;
+
+	this.sendElapsedTime();
+
 	var recordTime = game.time.totalElapsedSeconds() - this.startTime;
 	this.removeTimer();
 
@@ -45,6 +63,17 @@ RealtimeStageTimer.prototype.updateTimer = function() {
 		return;
 
 	this.elapsedTime = game.time.totalElapsedSeconds() - this.startTime;
+
+	var timeLeft = this.timeLimit - this.elapsedTime;
+	if(timeLeft < 0) {
+		this.stop();
+
+		if(this.onTimeOver !== null)
+			this.onTimeOver();
+
+		return;
+	}
+
 	this.sendElapsedTime();
 }
 
diff --git a/src/game/lib/util/time_util.js b/src/game/lib/util/time_util.js
index 6d04e99..29d47d6 100644
--- a/src/game/lib/util/time_util.js
+++ b/src/game/lib/util/time_util.js
@@ -46,6 +46,87 @@ TimeUtil.getTwoDigitSecondFromMS = function(timeMS) {
 
 
 
+TimeUtil.getFullHourFromSec = function(timeSec) {
+	return Math.floor(timeSec / TimeUtil.HOUR_SEC);
+}
+
+TimeUtil.getHourFromSec = function(timeSec) {
+	return TimeUtil.getFullHourFromSec(timeSec) % 24;
+}
+
+TimeUtil.getTwoDigitHourFromSec = function(timeSec) {
+	var twoDigitHour = TimeUtil.getHourFromSec(timeSec);
+	return StringUtil.getNumberStartWithZero(twoDigitHour, 2);
+}
+
+
+TimeUtil.getFullMinuteFromSec = function(timeSec) {
+	return Math.floor(timeSec / TimeUtil.MINUTE_SEC);
+}
+
+TimeUtil.getMinuteFromSec = function(timeSec) {
+	return TimeUtil.getFullMinuteFromSec(timeSec) % 60;
+}
+
+TimeUtil.getTwoDigitMinuteFromSec = function(timeSec) {
+	var twoDigitMinute = TimeUtil.getMinuteFromSec(timeSec);
+	return StringUtil.getNumberStartWithZero(twoDigitMinute, 2);
+}
+
+
+TimeUtil.getFullSecondFromSec = function(timeSec) {
+	return Math.floor(timeSec / TimeUtil.SECOND_SEC);
+}
+
+TimeUtil.getSecondFromSec = function(timeSec) {
+	return TimeUtil.getFullSecondFromSec(timeSec) % 60;
+}
+
+TimeUtil.getTwoDigitSecondFromSec = function(timeSec) {
+	var twoDigitSecond = TimeUtil.getSecondFromSec(timeSec);
+	return StringUtil.getNumberStartWithZero(twoDigitSecond, 2);
+}
+
+
+
+TimeUtil.printTimeFromSec = function(timeSec) {
+	var fullTime = "";
+
+	var twoDigitHour = TimeUtil.getTwoDigitHourFromSec(timeSec);
+	if(twoDigitHour !== "00")
+		fullTime = twoDigitHour + "시간 ";
+
+	var twoDigitMinute = TimeUtil.getTwoDigitMinuteFromSec(timeSec);
+	if(twoDigitMinute !== "00")
+		fullTime = fullTime + twoDigitMinute + "분 ";
+
+	var twoDigitSecond = TimeUtil.getTwoDigitSecondFromSec(timeSec);
+	fullTime = fullTime + twoDigitSecond + "초";
+
+	return fullTime;
+}
+
+
+TimeUtil.printHHMMSSFromSec = function(timeSec) {
+	var fullTime = "";
+
+	var twoDigitHour = TimeUtil.getTwoDigitHourFromSec(timeSec);
+	if(twoDigitHour !== "00")
+		fullTime = twoDigitHour + ":";
+
+	var twoDigitMinute = TimeUtil.getTwoDigitMinuteFromSec(timeSec);
+	if(twoDigitMinute !== "00")
+		fullTime = fullTime + twoDigitMinute + ":";
+
+	var twoDigitSecond = TimeUtil.getTwoDigitSecondFromSec(timeSec);
+	fullTime = fullTime + twoDigitSecond;
+
+	return fullTime;
+}
+
+
+
+
 
 TimeUtil.getYYYYMMDD = function(date) {
 	// return date.toISOString().slice(0,10);
@@ -75,4 +156,10 @@ TimeUtil.printMonthDay = function(date) {
 TimeUtil.SECOND_MS	= 1000;
 TimeUtil.MINUTE_MS	= TimeUtil.SECOND_MS * 60;
 TimeUtil.HOUR_MS	= TimeUtil.MINUTE_MS * 60;
-TimeUtil.DAY_MS		= TimeUtil.HOUR_MS * 24;
\ No newline at end of file
+TimeUtil.DAY_MS		= TimeUtil.HOUR_MS * 24;
+
+
+TimeUtil.SECOND_SEC	= 1;
+TimeUtil.MINUTE_SEC	= TimeUtil.SECOND_SEC * 60;
+TimeUtil.HOUR_SEC	= TimeUtil.MINUTE_SEC * 60;
+TimeUtil.DAY_SEC	= TimeUtil.HOUR_SEC * 24;
\ No newline at end of file
diff --git a/src/game/typing/examination/game.js b/src/game/typing/examination/game.js
index 54c6a30..1522161 100644
--- a/src/game/typing/examination/game.js
+++ b/src/game/typing/examination/game.js
@@ -46,26 +46,22 @@ TypingExamination.prototype.create = function() {
 
 	this.averageTypingSpeedText = new AverageTypingSpeed();
 
-	this.textTimer = this.makeDefaultText(960, 30);
-	this.textTimer.anchor.set(1, 0.5);
-	this.textTimer.fontSize = 30;
+	this.textTimer = null;
+	this.realtimeStageTimer = new RealtimeStageTimer(TypingExamination.GAME_TIME_SEC);
+	this.realtimeStageTimer.setTimeUpdateEvent(
+		(function(timeLeftSec) {
+			if(this.textTimer === null)
+				return;
 
-	this.stageTimer = new RealtimeStageTimer(Phaser.Timer.SECOND * 300);
-	this.stageTimer.setTimeUpdateEvent(
-		(function(timeLeftMS) {
-			this.textTimer.text = "남은 시간 : " + Math.floor(timeLeftMS);
+			this.textTimer.text = TimeUtil.printHHMMSSFromSec(timeLeftSec);
 		}).bind(this)
 	);
-	this.stageTimer.start();
-	/*
-	this.stageTimer = new StageTimer(
-		TypingExamination.GAME_TIME_SEC,
+	this.realtimeStageTimer.setTimeOverEvent(
 		(function() {
-			// this.setClickEnable(false);
-			this.timeOver();
+			this.textTimer.text = "타임 오버";
+			console.log("Time over");
 		}).bind(this)
 	);
-	*/
 
 
 	// bottom ui
@@ -82,6 +78,7 @@ TypingExamination.prototype.fontLoaded = function() {
 	// this.animalRecordList.hide();
 	this.animalRecordList.applyLoadedFont();
 
+	this.makeStageTimerText();
 	this.makeTextContents();
 }
 
@@ -96,6 +93,13 @@ TypingExamination.prototype.makeDefaultText = function(x, y) {
 	return defaultText;
 }
 
+TypingExamination.prototype.makeStageTimerText = function() {
+	this.textTimer = this.makeDefaultText(960, 30);
+	this.textTimer.anchor.set(1, 0.5);
+	this.textTimer.fontSize = 30;
+	this.textTimer.text = TimeUtil.printHHMMSSFromSec(TypingExamination.GAME_TIME_SEC);
+}
+
 TypingExamination.prototype.makeUnderlineText = function(x, y) {
 	var CONTENT_TEXT_WIDTH	= 800;
 	var CONTENT_UNDERLINE_OFFSET_Y = 20;	// 17;
@@ -278,7 +282,7 @@ TypingExamination.prototype.startGame = function() {
 	this.showTypingExaminationContents();
 	this.showPlayingWordNumber();
 
-	// this.stageTimer.start();
+	this.realtimeStageTimer.start();
 }
 
 TypingExamination.prototype.timeOver = function() {
@@ -290,7 +294,7 @@ TypingExamination.prototype.gameOver = function() {
 	var missionClearText = new MissionClearText();
 	this.stopAndGoResult();
 
-	// this.stageTimer.pause();
+	this.realtimeStageTimer.pause();
 }
 
 TypingExamination.prototype.stopAndGoResult = function() {
@@ -636,7 +640,7 @@ TypingExamination.prototype.setTimeTypingStart = function() {
 }
 
 
-TypingExamination.GAME_TIME_SEC					= 60 * 5;	// 5 minutes
+TypingExamination.GAME_TIME_SEC					= TimeUtil.MINUTE_SEC * 5;	// 5 minutes
 
 TypingExamination.SPACE_INDICATOR				= "␣";	// "ˇ";	// "ᵔ";	// "ᵕ";	// "ˣ";	// "ᵛ";	// " · ";
 TypingExamination.ENTER_INDICATOR				= "⏎";	// "↵";	// "↵";
diff --git a/src/web/client/typing_exam.html b/src/web/client/typing_exam.html
index 5f34364..eb8f6d7 100644
--- a/src/web/client/typing_exam.html
+++ b/src/web/client/typing_exam.html
@@ -46,6 +46,7 @@
 		<script src="../../game/lib/util/string_util.js"></script>
 		<script src="../../game/lib/util/number_util.js"></script>
 		<script src="../../game/lib/util/record_util.js"></script>
+		<script src="../../game/lib/util/time_util.js"></script>
 
 		<script src="../../game/lib/text/input_type_text.js"></script>
 		<script src="../../game/lib/text/time_over_text.js"></script>
diff --git a/test/tdd.js b/test/tdd.js
index a454884..86c4a6e 100644
--- a/test/tdd.js
+++ b/test/tdd.js
@@ -46,6 +46,8 @@ QUnit.test( "TimeUtil", function( assert ) {
 	assert.equal(TimeUtil.getHourFromMS(testTimeMS), 9, "getHourFromMS");
 	assert.equal(TimeUtil.getTwoDigitHourFromMS(testTimeMS), "09", "getTwoDigitHourFromMS");
 
+	testTimeMS = 3000;
+	assert.equal(TimeUtil.getTwoDigitSecondFromMS(testTimeMS), "03", "getTwoDigitHourFromMS");
 });