diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 398b755..fee4c1a 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -14,12 +14,17 @@
         tools:targetApi="31">
         <activity
             android:name=".MainActivity"
-            android:exported="true" >
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
+
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".SecondActivity"
+            android:exported="true">
+        </activity>
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/example/android_25_2/MainActivity.kt b/app/src/main/java/com/example/android_25_2/MainActivity.kt
index aed359b..cf17083 100644
--- a/app/src/main/java/com/example/android_25_2/MainActivity.kt
+++ b/app/src/main/java/com/example/android_25_2/MainActivity.kt
@@ -1,12 +1,21 @@
 package com.example.android_25_2
 
+import android.content.Intent
 import android.os.Bundle
+import android.util.Log
+import android.widget.Button
+import android.widget.TextView
+import android.widget.Toast
 import androidx.activity.enableEdgeToEdge
+import androidx.activity.result.ActivityResultLauncher
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
+import kotlin.random.Random
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var launcher: ActivityResultLauncher<Intent>
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         enableEdgeToEdge()
@@ -16,5 +25,33 @@ class MainActivity : AppCompatActivity() {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
             insets
         }
+
+        launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {}
+
+        val textView: TextView = findViewById(R.id.textView_main)
+
+        val toastButton: Button = findViewById(R.id.button_toast)
+        toastButton.setOnClickListener {
+            Toast.makeText(this, getString(R.string.toast_message), Toast.LENGTH_SHORT).show()
+        }
+
+        val countButton: Button = findViewById(R.id.button_count)
+        countButton.setOnClickListener {
+            val currentText1 = textView.text.toString().toInt()
+            val newCount = currentText1 + 1
+            textView.text = newCount.toString()
+        }
+
+        val randomButton: Button = findViewById(R.id.button_random)
+        randomButton.setOnClickListener {
+            val randomNumber = Random.nextInt(0, 15)
+            launchSecondActivity(randomNumber)
+        }
+    }
+
+    private fun launchSecondActivity(randomNumber: Int) {
+        val intent = Intent(this, SecondActivity::class.java)
+        intent.putExtra("random_number", randomNumber)
+        launcher.launch(intent)
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/android_25_2/SecondActivity.kt b/app/src/main/java/com/example/android_25_2/SecondActivity.kt
new file mode 100644
index 0000000..b398334
--- /dev/null
+++ b/app/src/main/java/com/example/android_25_2/SecondActivity.kt
@@ -0,0 +1,43 @@
+package com.example.android_25_2
+
+import android.app.Activity
+import android.content.Intent
+import android.os.Bundle
+import android.util.Log
+import android.widget.Button
+import android.widget.TextView
+import androidx.activity.result.ActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.activity.result.registerForActivityResult
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import kotlin.random.Random
+
+class SecondActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_second)
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.Second)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+        Log.e("MYLOG","done3")
+
+        val textView: TextView = findViewById(R.id.textView_main)
+        val randomButton: Button = findViewById(R.id.button_random)
+
+        val receivedRandomNumber = intent.getIntExtra("random_number", 0)
+        textView.text = receivedRandomNumber.toString()
+
+        randomButton.setOnClickListener {
+            val randomNumber = Random.nextInt(0, 15)
+            textView.text = randomNumber.toString()
+        }
+
+        val resultIntent = Intent()
+        resultIntent.putExtra("random_number", textView.text)
+        setResult(Activity.RESULT_OK, resultIntent)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/drawable/ic_logo_google.png b/app/src/main/res/drawable/ic_logo_google.png
new file mode 100644
index 0000000..f39297a
Binary files /dev/null and b/app/src/main/res/drawable/ic_logo_google.png differ
diff --git a/app/src/main/res/drawable/ic_logo_kakao.png b/app/src/main/res/drawable/ic_logo_kakao.png
new file mode 100644
index 0000000..712c565
Binary files /dev/null and b/app/src/main/res/drawable/ic_logo_kakao.png differ
diff --git a/app/src/main/res/drawable/ic_logo_naver.png b/app/src/main/res/drawable/ic_logo_naver.png
new file mode 100644
index 0000000..ac4036e
Binary files /dev/null and b/app/src/main/res/drawable/ic_logo_naver.png differ
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 9affce0..b184c3c 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,10 +1,63 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<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:id="@+id/main"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@color/blue"
     tools:context=".MainActivity">
 
+    <TextView
+        android:id="@+id/textView_main"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="0"
+        android:textSize="50sp"
+        android:textColor="@color/white"
+        android:textStyle="bold"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginTop="250dp"/>
+
+    <Button
+        android:id="@+id/button_count"
+        android:layout_width="80dp"
+        android:layout_height="35dp"
+        android:text="@string/message_button_count"
+        android:textSize="9dp"
+        android:backgroundTint="@color/purple_200"
+        app:layout_constraintTop_toBottomOf="@+id/textView_main"
+        android:layout_marginTop="200dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <Button
+        android:id="@+id/button_toast"
+        android:layout_width="80dp"
+        android:layout_height="35dp"
+        android:text="@string/message_button_toast"
+        android:textSize="9dp"
+        android:backgroundTint="@color/purple_200"
+        app:layout_constraintTop_toBottomOf="@+id/textView_main"
+        android:layout_marginTop="200dp"
+        android:layout_marginEnd="180dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <Button
+        android:id="@+id/button_random"
+        android:layout_width="80dp"
+        android:layout_height="35dp"
+        android:text="@string/message_button_random"
+        android:textSize="9dp"
+        android:backgroundTint="@color/purple_200"
+        app:layout_constraintTop_toBottomOf="@+id/textView_main"
+        android:layout_marginTop="200dp"
+        android:layout_marginStart="180dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_second.xml b/app/src/main/res/layout/activity_second.xml
new file mode 100644
index 0000000..41ff6cc
--- /dev/null
+++ b/app/src/main/res/layout/activity_second.xml
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/Second"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/purple_500"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    tools:context=".SecondActivity">
+
+    <TextView
+        android:id="@+id/textView_main"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="0"
+        android:textSize="50sp"
+        android:textColor="@color/white"
+        android:textStyle="bold"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        android:layout_marginTop="250dp"/>
+
+    <Button
+        android:id="@+id/button_count"
+        android:layout_width="80dp"
+        android:layout_height="35dp"
+        android:text="@string/message_button_count"
+        android:textSize="9dp"
+        android:backgroundTint="@color/purple_200"
+        app:layout_constraintTop_toBottomOf="@+id/textView_main"
+        android:layout_marginTop="200dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <Button
+        android:id="@+id/button_toast"
+        android:layout_width="80dp"
+        android:layout_height="35dp"
+        android:text="@string/message_button_toast"
+        android:textSize="9dp"
+        android:backgroundTint="@color/purple_200"
+        app:layout_constraintTop_toBottomOf="@+id/textView_main"
+        android:layout_marginTop="200dp"
+        android:layout_marginEnd="180dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <Button
+        android:id="@+id/button_random"
+        android:layout_width="80dp"
+        android:layout_height="35dp"
+        android:text="@string/message_button_random"
+        android:textSize="9dp"
+        android:backgroundTint="@color/purple_200"
+        app:layout_constraintTop_toBottomOf="@+id/textView_main"
+        android:layout_marginTop="200dp"
+        android:layout_marginStart="180dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index f8c6127..774f18e 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -5,6 +5,7 @@
     <color name="purple_700">#FF3700B3</color>
     <color name="teal_200">#FF03DAC5</color>
     <color name="teal_700">#FF018786</color>
+    <color name="blue">#1E90FF</color>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 13379b4..08fce9e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,7 @@
 <resources>
     <string name="app_name">Android_25-2</string>
+    <string name="message_button_count">"COUNT"</string>
+    <string name="message_button_toast">"TOAST"</string>
+    <string name="message_button_random">"RANDOM"</string>
+    <string name="toast_message">"Boink"</string>
 </resources>
\ No newline at end of file