diff --git a/.gradle/config.properties b/.gradle/config.properties
new file mode 100644
index 0000000..76e9d26
--- /dev/null
+++ b/.gradle/config.properties
@@ -0,0 +1,2 @@
+#Tue Nov 26 00:44:34 KST 2024
+java.home=C\:\\Program Files\\Android\\Android Studio1\\jbr
diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..99b49d3
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+assignment02
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..ddf7151
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,233 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AndroidLayouts">
+    <shared>
+      <config />
+    </shared>
+    <layouts>
+      <layout url="file://$PROJECT_DIR$/app/src/main/res/layout/activity_main.xml">
+        <config>
+          <theme>@style/Theme.Assignment02</theme>
+        </config>
+      </layout>
+      <layout url="file://$PROJECT_DIR$/app/src/main/res/layout/fragment_authority.xml">
+        <config>
+          <theme>@style/Theme.Assignment02</theme>
+        </config>
+      </layout>
+      <layout url="file://$PROJECT_DIR$/app/src/main/res/layout/fragment_list.xml">
+        <config>
+          <theme>@style/Theme.Assignment02</theme>
+        </config>
+      </layout>
+      <layout url="file://$PROJECT_DIR$/app/src/main/res/layout/fragment_list_item.xml">
+        <config>
+          <theme>@style/Theme.Assignment02</theme>
+        </config>
+      </layout>
+      <layout url="file://$PROJECT_DIR$/app/src/main/res/layout/list_item.xml">
+        <config>
+          <theme>@style/Theme.Assignment02</theme>
+        </config>
+      </layout>
+    </layouts>
+  </component>
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="NONE" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="66610982-134f-47c4-a8b4-c3cdf03dc3f9" name="Changes" comment="">
+      <change afterPath="$PROJECT_DIR$/app/src/main/res/layout/list_item.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/java/com/example/assignment02/AuthorityFragment.kt" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/java/com/example/assignment02/ListFragment.kt" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/java/com/example/assignment02/MainActivity.kt" beforeDir="false" afterPath="$PROJECT_DIR$/app/src/main/java/com/example/assignment02/MainActivity.kt" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/java/com/example/assignment02/PlayMusic.kt" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/res/layout/activity_main.xml" beforeDir="false" afterPath="$PROJECT_DIR$/app/src/main/res/layout/activity_main.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/res/layout/fragment_authority.xml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/res/layout/fragment_list.xml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/app/src/main/res/layout/fragment_list_item.xml" beforeDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="ClangdSettings">
+    <option name="formatViaClangd" value="false" />
+  </component>
+  <component name="ExecutionTargetManager" SELECTED_TARGET="device_and_snapshot_combo_box_target[C:\Users\상상\.android\avd\Medium_Phone_API_33.avd]" />
+  <component name="ExternalProjectsData">
+    <projectState path="$PROJECT_DIR$">
+      <ProjectState />
+    </projectState>
+  </component>
+  <component name="ExternalProjectsManager">
+    <system id="GRADLE">
+      <state>
+        <task path="$PROJECT_DIR$/app">
+          <activation />
+        </task>
+        <projects_view>
+          <tree_state>
+            <expand>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="assignment02" type="f1a62948:ProjectNode" />
+              </path>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="assignment02" type="f1a62948:ProjectNode" />
+                <item name="app" type="2d1252cf:ModuleNode" />
+              </path>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="assignment02" type="f1a62948:ProjectNode" />
+                <item name="app" type="2d1252cf:ModuleNode" />
+                <item name="Tasks" type="e4a08cd1:TasksNode" />
+              </path>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="assignment02" type="f1a62948:ProjectNode" />
+                <item name="app" type="2d1252cf:ModuleNode" />
+                <item name="Tasks" type="e4a08cd1:TasksNode" />
+                <item name="other" type="c8890929:TasksNode$1" />
+              </path>
+            </expand>
+            <select />
+          </tree_state>
+        </projects_view>
+      </state>
+    </system>
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+        <option value="Kotlin Class" />
+        <option value="layoutResourceFile" />
+      </list>
+    </option>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="ProjectId" id="2okHCiQbUQEHdzpGipW9Nn9xt3D" />
+  <component name="ProjectViewState">
+    <option name="autoscrollToSource" value="true" />
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;RunOnceActivity.OpenProjectViewOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.cidr.known.project.marker&quot;: &quot;true&quot;,
+    &quot;cf.first.check.clang-format&quot;: &quot;false&quot;,
+    &quot;cidr.known.project.marker&quot;: &quot;true&quot;,
+    &quot;com.google.services.firebase.aqiPopupShown&quot;: &quot;true&quot;,
+    &quot;last_directory_selection&quot;: &quot;C:/Users/Public/assignment02/app/src/main/java&quot;,
+    &quot;last_opened_file_path&quot;: &quot;C:/Users/Public/assignment02&quot;,
+    &quot;settings.editor.selected.configurable&quot;: &quot;AndroidSdkUpdater&quot;
+  }
+}</component>
+  <component name="RecentsManager">
+    <key name="CopyFile.RECENT_KEYS">
+      <recent name="C:\Users\Public\assignment02\app\src\main\res\layout" />
+    </key>
+    <key name="MoveKotlinTopLevelDeclarationsDialog.RECENTS_KEY">
+      <recent name="" />
+    </key>
+  </component>
+  <component name="RunManager">
+    <configuration name="app" type="AndroidRunConfigurationType" factoryName="Android App">
+      <module name="assignment02.app.main" />
+      <option name="DEPLOY" value="true" />
+      <option name="DEPLOY_APK_FROM_BUNDLE" value="false" />
+      <option name="DEPLOY_AS_INSTANT" value="false" />
+      <option name="ARTIFACT_NAME" value="" />
+      <option name="PM_INSTALL_OPTIONS" value="" />
+      <option name="ALL_USERS" value="false" />
+      <option name="ALWAYS_INSTALL_WITH_PM" value="false" />
+      <option name="CLEAR_APP_STORAGE" value="false" />
+      <option name="DYNAMIC_FEATURES_DISABLED_LIST" value="" />
+      <option name="ACTIVITY_EXTRA_FLAGS" value="" />
+      <option name="MODE" value="default_activity" />
+      <option name="CLEAR_LOGCAT" value="false" />
+      <option name="SHOW_LOGCAT_AUTOMATICALLY" value="false" />
+      <option name="INSPECTION_WITHOUT_ACTIVITY_RESTART" value="false" />
+      <option name="TARGET_SELECTION_MODE" value="DEVICE_AND_SNAPSHOT_COMBO_BOX" />
+      <option name="SELECTED_CLOUD_MATRIX_CONFIGURATION_ID" value="-1" />
+      <option name="SELECTED_CLOUD_MATRIX_PROJECT_ID" value="" />
+      <option name="DEBUGGER_TYPE" value="Auto" />
+      <Auto>
+        <option name="USE_JAVA_AWARE_DEBUGGER" value="false" />
+        <option name="SHOW_STATIC_VARS" value="true" />
+        <option name="WORKING_DIR" value="" />
+        <option name="TARGET_LOGGING_CHANNELS" value="lldb process:gdb-remote packets" />
+        <option name="SHOW_OPTIMIZED_WARNING" value="true" />
+        <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+        <option name="DEBUG_SANDBOX_SDK" value="false" />
+      </Auto>
+      <Hybrid>
+        <option name="USE_JAVA_AWARE_DEBUGGER" value="false" />
+        <option name="SHOW_STATIC_VARS" value="true" />
+        <option name="WORKING_DIR" value="" />
+        <option name="TARGET_LOGGING_CHANNELS" value="lldb process:gdb-remote packets" />
+        <option name="SHOW_OPTIMIZED_WARNING" value="true" />
+        <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+        <option name="DEBUG_SANDBOX_SDK" value="false" />
+      </Hybrid>
+      <Java>
+        <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+        <option name="DEBUG_SANDBOX_SDK" value="false" />
+      </Java>
+      <Native>
+        <option name="USE_JAVA_AWARE_DEBUGGER" value="false" />
+        <option name="SHOW_STATIC_VARS" value="true" />
+        <option name="WORKING_DIR" value="" />
+        <option name="TARGET_LOGGING_CHANNELS" value="lldb process:gdb-remote packets" />
+        <option name="SHOW_OPTIMIZED_WARNING" value="true" />
+        <option name="ATTACH_ON_WAIT_FOR_DEBUGGER" value="false" />
+        <option name="DEBUG_SANDBOX_SDK" value="false" />
+      </Native>
+      <Profilers>
+        <option name="ADVANCED_PROFILING_ENABLED" value="false" />
+        <option name="STARTUP_PROFILING_ENABLED" value="false" />
+        <option name="STARTUP_CPU_PROFILING_ENABLED" value="false" />
+        <option name="STARTUP_CPU_PROFILING_CONFIGURATION_NAME" value="Java/Kotlin Method Sample (legacy)" />
+        <option name="STARTUP_NATIVE_MEMORY_PROFILING_ENABLED" value="false" />
+        <option name="NATIVE_MEMORY_SAMPLE_RATE_BYTES" value="2048" />
+      </Profilers>
+      <option name="DEEP_LINK" value="" />
+      <option name="ACTIVITY_CLASS" value="" />
+      <option name="SEARCH_ACTIVITY_IN_GLOBAL_SCOPE" value="false" />
+      <option name="SKIP_ACTIVITY_VALIDATION" value="false" />
+      <method v="2">
+        <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+      </method>
+    </configuration>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="66610982-134f-47c4-a8b4-c3cdf03dc3f9" name="Changes" comment="" />
+      <created>1731406527910</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1731406527910</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State />
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 166076e..25059fe 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -5,7 +5,7 @@ plugins {
 
 android {
     namespace = "com.example.assignment02"
-    compileSdk = 34
+    compileSdk = 35
 
     defaultConfig {
         applicationId = "com.example.assignment02"
@@ -36,11 +36,11 @@ android {
 }
 
 dependencies {
-    implementation("androidx.activity:activity-ktx:1.7.0")
-    implementation("androidx.core:core-ktx:1.13.1")
+
+    implementation("androidx.core:core-ktx:1.15.0")
     implementation("androidx.appcompat:appcompat:1.7.0")
     implementation("com.google.android.material:material:1.12.0")
-    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+    implementation("androidx.constraintlayout:constraintlayout:2.2.0")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.2.1")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.6.1")
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index c9ef4a9..27c7204 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -2,6 +2,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
@@ -21,7 +25,10 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity android:name=".RandomActivity" />
+        <service
+            android:name=".PlayMusic"
+            android:permission="android.permission.BIND_JOB_SERVICE"
+            android:foregroundServiceType="mediaPlayback" />
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/example/assignment02/MainActivity.kt b/app/src/main/java/com/example/assignment02/MainActivity.kt
index acbfa04..79533cf 100644
--- a/app/src/main/java/com/example/assignment02/MainActivity.kt
+++ b/app/src/main/java/com/example/assignment02/MainActivity.kt
@@ -1,42 +1,117 @@
 package com.example.assignment02
 
-import android.app.Activity
-import android.content.Intent
+import android.Manifest
+import android.content.pm.PackageManager
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
 import android.widget.TextView
-import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.core.content.ContentProviderCompat.requireContext
+import androidx.core.content.ContextCompat
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 class MainActivity : AppCompatActivity() {
+    private var running = false
+    private var timer: Job? = null
+    private var time: Long = 0
+    private var stime: Long = 0
+    private var etime: Long = 0
+
+    private var adapter: TimeAdapter? = null
+    private var time_list = mutableListOf<String>()
+
+    private lateinit var time_text: TextView
+    private lateinit var start_text: TextView
+    private lateinit var stop_text: TextView
+    private lateinit var lap_text: TextView
+    private lateinit var time_view: RecyclerView
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
-        val number_text: TextView = findViewById(R.id.number_text)
-        val count_btn: TextView = findViewById(R.id.count_btn)
-        val toast_btn: TextView = findViewById(R.id.toast_btn)
-        val random_btn: TextView = findViewById(R.id.random_btn)
-        val intent = Intent(this, RandomActivity::class.java)
-
-        val resultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-            if (result.resultCode == Activity.RESULT_OK) {
-                number_text.text = result.data?.getIntExtra("random_number", 0).toString()
-                Toast.makeText(this, "OK", Toast.LENGTH_SHORT).show()
+
+        time_text = findViewById(R.id.timeText)
+        start_text = findViewById(R.id.startText)
+        stop_text = findViewById(R.id.stopText)
+        lap_text = findViewById(R.id.lapText)
+        time_view = findViewById(R.id.timeList)
+
+        time_view.layoutManager = LinearLayoutManager(this)
+        time_view.adapter = TimeAdapter(time_list)
+
+        start_text.setOnClickListener {
+            if (running) {
+                start_text.text = "START"
+                pauseTimer()
             }
-            else {
-                Toast.makeText(this, "오류", Toast.LENGTH_SHORT).show()
+            if (!running) {
+                start_text.text = "PAUSE"
+                startTimer()
             }
+            running = !running
         }
-
-        count_btn.setOnClickListener {
-            number_text.text = (number_text.text.toString().toInt()+1).toString()
+        stop_text.setOnClickListener {
+            start_text.text = "START"
+            time_text.text = String.format("00:00:00")
+            running = false
+            pauseTimer()
+            time = 0
+        }
+        lap_text.setOnClickListener {
+            time_list.add(time_text.text.toString())
+            adapter?.notifyItemInserted(time_list.size - 1) // 리스트가 업데이트된 항목만 갱신
+            time_view.scrollToPosition(time_list.size - 1)
         }
-        toast_btn.setOnClickListener {
-            Toast.makeText(this, "숫자 : "+number_text.text, Toast.LENGTH_LONG).show()
+    }
+
+    private fun startTimer(){
+        stime = System.currentTimeMillis()
+        timer = CoroutineScope(Dispatchers.Main).launch {
+            while(true){
+                delay(5)
+                etime = System.currentTimeMillis()
+                time += etime-stime
+                time_text.text = String.format("%02d:%02d:%02d", time/60000, (time%60000)/1000, (time%1000)/10)
+                stime = etime
+            }
         }
-        random_btn.setOnClickListener {
-            intent.putExtra("number", number_text.text.toString().toInt())
-            resultLauncher.launch(intent)
+    }
+
+    private fun pauseTimer(){
+        timer?.cancel()
+    }
+}
+
+class TimeAdapter(private val timeList: List<String>) :
+    RecyclerView.Adapter<TimeAdapter.TimeViewHolder>() {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TimeViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.list_item, parent, false)
+        return TimeViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: TimeViewHolder, position: Int) {
+        holder.bind(timeList[position])
+    }
+
+    override fun getItemCount(): Int = timeList.size
+
+    class TimeViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        private val time_text: TextView = itemView.findViewById(R.id.timeText)
+
+        fun bind(time: String) {
+            time_text.text = time
         }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/assignment02/RandomActivity.kt b/app/src/main/java/com/example/assignment02/RandomActivity.kt
deleted file mode 100644
index 095b881..0000000
--- a/app/src/main/java/com/example/assignment02/RandomActivity.kt
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.example.assignment02
-
-import android.content.Intent
-import android.os.Bundle
-import android.widget.TextView
-import androidx.appcompat.app.AppCompatActivity
-import kotlin.random.Random
-
-class RandomActivity : AppCompatActivity()  {
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_random)
-        val number_text: TextView = findViewById(R.id.number_text)
-        val number = intent.getIntExtra("number", 1) // 123
-        val resultIntent = Intent()
-
-        if (number > 0){
-            val random_number = Random.nextInt(0, number)  // 0부터 99까지의 랜덤 값
-            number_text.text = random_number.toString()
-            resultIntent.putExtra("random_number", random_number)
-            setResult(RESULT_OK, resultIntent)
-        } else {
-            number_text.text = number.toString()
-            resultIntent.putExtra("random_number", number)
-            setResult(RESULT_OK, resultIntent)
-        }
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 0fb246d..0f3007b 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,49 +4,59 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:padding="30dp"
+    android:padding="25dp"
     tools:context=".MainActivity">
 
     <TextView
-        android:id="@+id/number_text"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="0"
-        android:textSize="48sp"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
+        android:id="@+id/timeText"
+        android:layout_width="match_parent"
+        android:layout_height="200dp"
+        android:gravity="center"
+        android:text="00 : 00 : 00"
+        app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintEnd_toEndOf="parent" />
 
-    <Button
-        android:id="@+id/count_btn"
-        android:layout_width="wrap_content"
+    <TextView
+        android:id="@+id/startText"
+        android:layout_width="90dp"
         android:layout_height="wrap_content"
-        android:text="Count"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/number_text"
-        app:layout_constraintVertical_bias="0.5" />
+        android:layout_margin="5dp"
+        android:gravity="center"
+        android:padding="20dp"
+        android:text="START"
+        app:layout_constraintStart_toStartOf="@id/timeText"
+        app:layout_constraintTop_toBottomOf="@id/timeText" />
 
-    <Button
-        android:id="@+id/toast_btn"
-        android:layout_width="wrap_content"
+    <TextView
+        android:id="@+id/stopText"
+        android:layout_width="90dp"
         android:layout_height="wrap_content"
-        android:text="Toast"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/number_text"
-        app:layout_constraintVertical_bias="0.5" />
+        android:layout_margin="5dp"
+        android:gravity="center"
+        android:padding="20dp"
+        android:text="STOP"
+        app:layout_constraintEnd_toEndOf="@id/timeText"
+        app:layout_constraintStart_toStartOf="@id/timeText"
+        app:layout_constraintTop_toBottomOf="@id/timeText" />
 
-    <Button
-        android:id="@+id/random_btn"
-        android:layout_width="wrap_content"
+    <TextView
+        android:id="@+id/lapText"
+        android:layout_width="90dp"
         android:layout_height="wrap_content"
-        android:text="Random"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/number_text"
-        app:layout_constraintVertical_bias="0.5" />
+        android:layout_margin="5dp"
+        android:gravity="center"
+        android:padding="20dp"
+        android:text="LAP"
+        app:layout_constraintEnd_toEndOf="@id/timeText"
+        app:layout_constraintTop_toBottomOf="@id/timeText" />
 
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/timeList"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_marginTop="5dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/startText"
+        tools:layout_editor_absoluteX="25dp" />
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_random.xml b/app/src/main/res/layout/activity_random.xml
deleted file mode 100644
index 3f6e6ae..0000000
--- a/app/src/main/res/layout/activity_random.xml
+++ /dev/null
@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:padding="30dp"
-    tools:context=".MainActivity">
-
-    <TextView
-        android:id="@+id/number_text"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="0"
-        android:textSize="48sp"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-
-</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/list_item.xml b/app/src/main/res/layout/list_item.xml
new file mode 100644
index 0000000..2978e85
--- /dev/null
+++ b/app/src/main/res/layout/list_item.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal"
+    android:padding="20dp">
+
+    <TextView
+        android:id="@+id/numText"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="5dp"
+        android:layout_marginRight="25dp"
+        android:text="◈" />
+
+    <TextView
+        android:id="@+id/timeText"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:text="TextView" />
+</LinearLayout>
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 731cd98..b849030 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,4 +1,4 @@
-#Tue Nov 12 19:15:37 KST 2024
+#Tue Nov 26 00:44:39 KST 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip