diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index e86faf7..f00c680 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -7,6 +7,10 @@ android {
     namespace = "com.alom.androidstudy1"
     compileSdk = 34
 
+    buildFeatures{
+        viewBinding = true
+    }
+
     defaultConfig {
         applicationId = "com.alom.androidstudy1"
         minSdk = 26
diff --git a/app/src/main/java/com/alom/androidstudy1/MainActivity.kt b/app/src/main/java/com/alom/androidstudy1/MainActivity.kt
index c1bcbbf..37f08c1 100644
--- a/app/src/main/java/com/alom/androidstudy1/MainActivity.kt
+++ b/app/src/main/java/com/alom/androidstudy1/MainActivity.kt
@@ -5,16 +5,30 @@ import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import com.alom.androidstudy1.databinding.ActivityMainBinding
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityMainBinding
+    private lateinit var memoViewModel: MemoViewModel
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        enableEdgeToEdge()
-        setContentView(R.layout.activity_main)
-        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
-            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
-            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
-            insets
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        memoViewModel = ViewModelProvider(this)[MemoViewModel::class.java]
+
+        binding.btnSave.setOnClickListener{
+            memoViewModel.updateMemo(binding.etText.text.toString())
+        }
+
+        lifecycleScope.launch {
+            memoViewModel.currentValue.collect{
+                binding.etText.setText(it)
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/alom/androidstudy1/MemoViewModel.kt b/app/src/main/java/com/alom/androidstudy1/MemoViewModel.kt
new file mode 100644
index 0000000..a8ecd45
--- /dev/null
+++ b/app/src/main/java/com/alom/androidstudy1/MemoViewModel.kt
@@ -0,0 +1,27 @@
+package com.alom.androidstudy1
+
+import android.app.Application
+import android.content.Context
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+class MemoViewModel(application: Application) : AndroidViewModel(application) {
+
+    private val preferenceUtil = PreferenceUtil(getApplication<Application>().applicationContext)
+    private val _currentValue = MutableStateFlow<String>("")
+
+    val currentValue: StateFlow<String> = _currentValue
+
+    init{
+        _currentValue.value = preferenceUtil.getString("memo", "")
+    }
+
+    fun updateMemo(newMemo: String) {
+        _currentValue.value = newMemo
+        preferenceUtil.setString("memo", newMemo)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/alom/androidstudy1/PreferenceUtil.kt b/app/src/main/java/com/alom/androidstudy1/PreferenceUtil.kt
new file mode 100644
index 0000000..1291e50
--- /dev/null
+++ b/app/src/main/java/com/alom/androidstudy1/PreferenceUtil.kt
@@ -0,0 +1,17 @@
+package com.alom.androidstudy1
+
+import android.content.Context
+import android.content.SharedPreferences
+
+class PreferenceUtil(context: Context) {
+    private val prefs: SharedPreferences =
+        context.getSharedPreferences("MemoApplication", Context.MODE_PRIVATE)
+
+    fun getString(key: String, defValue: String): String {
+        return prefs.getString(key, defValue).toString()
+    }
+
+    fun setString(key: String, str: String) {
+        prefs.edit().putString(key, str).apply()
+    }
+}
\ 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 86a5d97..6ae8f5e 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -7,13 +7,19 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
+    <EditText
+        android:id="@+id/etText"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:gravity="center"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toTopOf="@+id/btnSave"
+        tools:text="22"/>
+
+    <Button
+        android:id="@+id/btnSave"
+        android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintBottom_toBottomOf="parent"/>
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 551d768..3aa22c4 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Sep 25 21:41:25 KST 2024
+#Mon Sep 30 10:06:39 KST 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists