diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index e86faf7..3fddd23 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
@@ -42,4 +46,11 @@ dependencies {
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
+
+    implementation(libs.lifecycle.viewmodel.ktx)
+    implementation(libs.lifecycle.livedata.ktx)
+    implementation(libs.lifecycle.runtime.ktx)
+
+    testImplementation(libs.spring.boot.starter.test)
+    testImplementation(libs.mockk)
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/alom/androidstudy1/MainActivity.kt b/app/src/main/java/com/alom/androidstudy1/MainActivity.kt
index c1bcbbf..234d2ef 100644
--- a/app/src/main/java/com/alom/androidstudy1/MainActivity.kt
+++ b/app/src/main/java/com/alom/androidstudy1/MainActivity.kt
@@ -1,20 +1,52 @@
 package com.alom.androidstudy1
 
 import android.os.Bundle
-import androidx.activity.enableEdgeToEdge
+import android.util.Log
+import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import com.alom.androidstudy1.databinding.ActivityMainBinding
+import kotlinx.coroutines.launch
 
 class MainActivity : AppCompatActivity() {
+    private lateinit var binding:ActivityMainBinding
+    private lateinit var mainViewModel: MainViewModel
     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)
+
+        val sharedPreference = getSharedPreferences("alom", MODE_PRIVATE)
+
+        // viewModel의 인자값으로 repository를 넘겨 줌
+        val repository = RepositoryImpl(sharedPreference)
+        val factory = ViewModelFactory(repository)
+
+        mainViewModel = ViewModelProvider(this, factory).get(MainViewModel::class.java)
+
+        lifecycleScope.launch {
+            lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                launch {
+                    mainViewModel.currentMemo.collect{ memo ->
+                        binding.etMemo.setText(memo)
+                        Log.d("MainActivity", "output memo: $memo")
+                    }
+                }
+            }
+        }
+
+        binding.btnSave.setOnClickListener {
+            val newMemo = binding.etMemo.text.toString().trim()
+            if(newMemo.isEmpty()){
+                Toast.makeText(this, "저장할 메모를 입력해 주세요", Toast.LENGTH_SHORT).show()
+            }
+            else {
+                mainViewModel.updateValue(newMemo)
+                Toast.makeText(this, "저장됨", Toast.LENGTH_SHORT).show()
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/alom/androidstudy1/MainViewModel.kt b/app/src/main/java/com/alom/androidstudy1/MainViewModel.kt
new file mode 100644
index 0000000..eee4c0b
--- /dev/null
+++ b/app/src/main/java/com/alom/androidstudy1/MainViewModel.kt
@@ -0,0 +1,39 @@
+package com.alom.androidstudy1
+
+import android.annotation.SuppressLint
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+class MainViewModel(private val repository: Repository): ViewModel() {
+    private var _currentMemo = MutableStateFlow("")
+
+    val currentMemo: StateFlow<String>
+        get() = _currentMemo.asStateFlow()
+
+    init {
+
+        viewModelScope.launch {
+            val memo = withContext(Dispatchers.IO) {
+                repository.getMemo()
+            }
+            _currentMemo.emit(memo)
+        }
+    }
+
+
+    @SuppressLint("CommitPrefEdits")
+    fun updateValue(input: String) {
+        viewModelScope.launch {
+            _currentMemo.emit(input)
+            withContext(Dispatchers.IO) {
+                repository.setMemo(input)
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/alom/androidstudy1/Repository.kt b/app/src/main/java/com/alom/androidstudy1/Repository.kt
new file mode 100644
index 0000000..51e6a69
--- /dev/null
+++ b/app/src/main/java/com/alom/androidstudy1/Repository.kt
@@ -0,0 +1,9 @@
+package com.alom.androidstudy1
+
+import android.content.SharedPreferences
+import kotlinx.coroutines.flow.MutableStateFlow
+
+interface Repository {
+    suspend fun getMemo(): String
+    suspend fun setMemo(input: String)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/alom/androidstudy1/RepositoryImpl.kt b/app/src/main/java/com/alom/androidstudy1/RepositoryImpl.kt
new file mode 100644
index 0000000..ddda8db
--- /dev/null
+++ b/app/src/main/java/com/alom/androidstudy1/RepositoryImpl.kt
@@ -0,0 +1,14 @@
+package com.alom.androidstudy1
+
+import android.content.SharedPreferences
+import kotlinx.coroutines.flow.MutableStateFlow
+
+class RepositoryImpl(private val sharedPreference: SharedPreferences): Repository {
+    override suspend fun getMemo(): String {
+        return sharedPreference.getString("memo", "").toString()
+    }
+
+    override suspend fun setMemo(input: String) {
+        sharedPreference.edit().putString("memo", input).apply()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/alom/androidstudy1/ViewModelFactory.kt b/app/src/main/java/com/alom/androidstudy1/ViewModelFactory.kt
new file mode 100644
index 0000000..2a66f79
--- /dev/null
+++ b/app/src/main/java/com/alom/androidstudy1/ViewModelFactory.kt
@@ -0,0 +1,14 @@
+package com.alom.androidstudy1
+
+import android.content.SharedPreferences
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+
+class ViewModelFactory(private val repository: Repository): ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(MainViewModel::class.java)) {
+            return MainViewModel(repository) as T
+        }
+        throw IllegalArgumentException("ViewModel class not found")
+    }
+}
\ 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..ac18dc2 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -8,12 +8,44 @@
     tools:context=".MainActivity">
 
     <TextView
+        android:id="@+id/tv_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:text="메모장"
+        android:gravity="center"
+        android:layout_marginTop="10dp"
+        />
+    
+    <EditText
+        android:id="@+id/et_memo"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toBottomOf="@id/tv_title"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/btn_save"
+        android:gravity="start|center_vertical"
+        android:background="#D8D8D8"
+        android:layout_margin="10dp"
+        android:text="edit text save"
+        android:padding="5dp"
+        />
+
+    <androidx.appcompat.widget.AppCompatButton
+        android:id="@+id/btn_save"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/et_memo"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginBottom="10dp"
+        android:text="저장"
+        android:textColor="@color/white"
+        android:background="#9281CD"
+        />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index e0e8c2c..97afca5 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -9,6 +9,9 @@ appcompat = "1.7.0"
 material = "1.12.0"
 activity = "1.9.2"
 constraintlayout = "2.1.4"
+lifecycleVersion = "2.8.4"
+mockk = "1.12.5"
+
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -20,6 +23,13 @@ material = { group = "com.google.android.material", name = "material", version.r
 androidx-activity = { group = "androidx.activity", name = "activity", version.ref = "activity" }
 androidx-constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }
 
+lifecycle-viewmodel-ktx = { group = "androidx.lifecycle", name = "lifecycle-viewmodel-ktx", version.ref = "lifecycleVersion"}
+lifecycle-livedata-ktx = { group = "androidx.lifecycle", name = "lifecycle-livedata-ktx", version.ref = "lifecycleVersion"}
+lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleVersion"}
+
+mockk = { module = "io.mockk:mockk", version.ref = "mockk" }
+spring-boot-starter-test = { module = "org.springframework.boot:spring-boot-starter-test" }
+
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
 jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }