diff --git a/oop/.vscode/launch.json b/oop/.vscode/launch.json
new file mode 100644
index 0000000..a053d23
--- /dev/null
+++ b/oop/.vscode/launch.json
@@ -0,0 +1,14 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "program": "${file}"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/oop/ErrorCheck.js b/oop/ErrorCheck.js
new file mode 100644
index 0000000..42090cd
--- /dev/null
+++ b/oop/ErrorCheck.js
@@ -0,0 +1,35 @@
+const todoList = require('./data.js');
+
+const ErrorCheck = class {
+    syntaxError(input) {
+        let firstWord = input.match(/\w+/); 
+        let seperator = input.match(/\$/g); 
+        let zeroSeperator = (seperator===null);
+        if(zeroSeperator === true && !(firstWord[0] ==="undo" || firstWord[0] === "redo")) {
+            return false;
+        }else{
+            let zeroSeperator = (firstWord[0] ==="undo" || firstWord[0] === "redo");
+            let oneSeperator = ((firstWord[0] === "delete" || firstWord[0] === "show") && (seperator.length===1));
+            let twoSeperator = ((firstWord[0] === "add" || firstWord[0] === "update") && (seperator.length===2));
+            return zeroSeperator || oneSeperator || twoSeperator ? true : false;
+        }
+        
+    }
+    unknownIDError(ID) {
+        if(ID === NaN) {
+            return false;
+        } 
+        return !(todoList.filter(v => v["id"] === ID).length === 0) ? true : false;
+    }
+    duplicatedStatusError(ID, status) {
+        return !(todoList.filter(v => v["id"] === ID)[0]["status"] === status) ? true : false;
+    }
+}
+
+
+
+
+
+module.exports = {
+    ErrorCheck
+}
\ No newline at end of file
diff --git a/oop/data.js b/oop/data.js
new file mode 100644
index 0000000..48b47d8
--- /dev/null
+++ b/oop/data.js
@@ -0,0 +1,6 @@
+module.exports = [
+    { 'name': 'asdf1', 'tag': [ 'asdf' ], 'status': 'todo', 'id': 9547 },
+    { 'name': 'asdf2', 'tag': [ 'asdf' ], 'status': 'todo', 'id': 9546 },
+    { 'name': 'asdf3', 'tag': [ 'asdf' ], 'status': 'todo', 'id': 9545 },
+    { 'name': 'asdf4', 'tag': [ 'asdf' ], 'status': 'todo', 'id': 9544 }
+];
\ No newline at end of file
diff --git a/oop/errorMsg.js b/oop/errorMsg.js
new file mode 100644
index 0000000..2203061
--- /dev/null
+++ b/oop/errorMsg.js
@@ -0,0 +1,6 @@
+module.exports = {
+    'syntaxError' : "문법적으로 유효하지 않은 입력값입니다.",
+    'unknownIDError' : "ID 사용이 잘못되었습니다.",
+    'unknownID_duplicatedError' : "ID혹은 Status가 잘못되었습니다.",
+    'ELSE_ERROR' : "치명적인 오류가 발생했습니다." 
+}
\ No newline at end of file
diff --git a/oop/my-todo-func.js b/oop/my-todo-func.js
new file mode 100644
index 0000000..0a76672
--- /dev/null
+++ b/oop/my-todo-func.js
@@ -0,0 +1,253 @@
+const readline = require('readline');
+const todoList = require('./data.js');
+const errorCheck = require('./ErrorCheck.js');
+const errorMsg = require('./errorMsg.js');
+const todoPrint = require('./todoPrint.js');
+
+const Error = new errorCheck.ErrorCheck();
+const Print = new todoPrint.ShowPrint();
+
+const undoHistory = [];
+const redoHistory = [];
+
+
+let r = readline.createInterface({
+    input:process.stdin,
+    output:process.stdout
+});
+
+
+const todoForm = function (name, tag, status, id) {
+    this.name = name;
+    this.tag = [tag];
+    this.status = status;
+    this.id = id;
+}
+
+const HistoryForm = function (model, name, id, status, tag){
+        this.model = model;
+        this.name = name;
+        this.id = id;
+        this.status = status;
+        this.tag = tag;
+    }
+
+const showAllTimer = (input) => {
+    setTimeout(todoCommonMethod.prototype.todoCount, input);
+    setTimeout(()=>{r.prompt()} , input+1000) 
+}
+
+const todoCommonMethod = class {
+    todoCount() {
+        let todo = todoList.filter(v => v.status === 'todo').length;
+        let doing = todoList.filter(v => v.status === 'doing').length;
+        let done = todoList.filter(v => v.status === 'done').length;
+    
+        Print.printShowAll(todo,doing,done);
+    }
+    
+    showElse(input) {
+        let temp = todoList.filter(v => v.status === input).map((obj)=>{ return ` '${obj.name}, ${obj.id}번'`})
+        Print.printShowElse(temp.length, temp);
+    }
+    
+    makingID(){
+        return Math.floor(Math.random() * 10000);
+    }
+    
+    findDataIdObj(input){
+        let target = todoList.filter(v => v["id"] === input);
+        let targetName = target[0].name;
+        let targetIdx = todoList.indexOf(target[0]);    
+        return [targetIdx, targetName];
+    }
+}
+
+const Redo = class {
+    dataInput(input) {
+        redoHistory.push(input);
+    }
+    makeUpdateHistory(status) {
+        undoHistory[undoHistory.length-1]['prev_status'] = status;
+    }
+    redoModel(model) {
+        let target = redoHistory[redoHistory.length-1];
+        let [name, tag, status, id, prev_status] = [target['name'], target['tag'], target['status'], target['id'], target['prev_status']];
+    
+        switch (model) {
+            case 'add' :
+                let newTodoList = new todoForm(name, tag[0], status, id);
+                todoList.push(newTodoList)
+                undoHistory.pop();
+                break;
+            case 'update' :
+                todoModel.update(id, prev_status);
+                undoHistory.pop();
+                break;
+            case 'delete' :
+                todoModel.delete(id, name, tag, status);
+                undoHistory.pop();
+                break;
+        }
+    }       
+}
+const redo = new Redo();
+
+const Undo = class {
+    historyLengthCheck(form){
+        if(undoHistory.length < 3) {
+            undoHistory.push(form);
+        } else {
+            undoHistory.shift();
+            undoHistory.push(form);
+        }
+    }
+
+    makeAddHistory(model, name, id, status, tag ){
+        let historyForm = new HistoryForm(model, name, id, status, tag);
+        this.historyLengthCheck(historyForm)
+    }
+
+    makeElseHistory(model, idx) {
+        let todoListData = todoList[idx]
+        let [name, tag, status, id] = [todoListData['name'], todoListData['tag'], todoListData['status'], todoListData['id']];
+        let historyForm = new HistoryForm(model, name, id, status, tag );
+    
+        this.historyLengthCheck(historyForm)
+    }
+
+    undoModel(model) {
+        let target = undoHistory[undoHistory.length-1];
+        let [name, tag, status, id] = [target['name'], target['tag'], target['status'], target['id']];
+        
+        switch(model){
+        case 'add' :
+            this.undoAdd(id);
+            break;
+    
+        case 'update' :
+            this.undoUpdate(id, status);
+            break;
+    
+        case 'delete' :
+            this.undoDelete(id, name, tag, status)
+            break;
+        }
+    }   
+    
+    undoAdd(id) {
+        todoModel.delete(id)
+        undoHistory.pop();
+    }
+    undoUpdate(id, status) {
+        todoModel.update(id, status)
+        undoHistory.pop();
+    }
+    undoDelete(id, name, tag, status) {
+        let newTodoList = new todoForm(name, tag[0], status, id);
+        todoList.push(newTodoList)
+    }
+}
+
+const undo = new Undo()
+
+
+const TodoModel = class extends todoCommonMethod{
+    show(input) {
+        let status = input[0];
+        status === 'all' ? this.todoCount() : this.showElse(status);
+    }
+    add(input) {
+        let [name, tag] = input;
+        let id = this.makingID();
+        let newTodoList = new todoForm(name, tag, 'todo', id);
+        undo.makeAddHistory("add", name, id, 'todo', tag );
+
+        todoList.push(newTodoList);
+        
+        Print.printAdd(name,id);
+        showAllTimer(1000);
+    }
+    delete(id) {
+        let [targetIdx, targetName] = this.findDataIdObj(id)
+        undo.makeElseHistory('delete', targetIdx);
+        todoList.splice(targetIdx,1);
+    
+        Print.printDelete(targetName);
+        showAllTimer(1000);
+    }
+    update(id, status) {
+        let [targetIdx, targetName] = this.findDataIdObj(id)
+        undo.makeElseHistory('update', targetIdx);
+        todoList[targetIdx].status = status;
+        redo.makeUpdateHistory(status);
+
+
+        setTimeout(()=>{Print.printUpdate(targetName, status)}, 1000);
+        showAllTimer(4000);
+    } 
+    
+}
+
+
+const todoModel = new TodoModel();
+
+
+const todoMain = (answer) => {
+    if(Error.syntaxError(answer) === false) {
+        Print.printError(errorMsg.syntaxError);
+        return true;
+    }
+    
+    let tempArr = answer.match(/\w+/g);
+    let action = tempArr.shift(0);   
+
+    if(action === "add") {
+        todoModel.add(tempArr);
+
+    } else if(action === "delete") { 
+        tempArr[0] = Number(tempArr[0])
+        let ID = tempArr[0]
+        Error.unknownIDError(ID)==false ? Print.printError(errorMsg.unknownIDError) : todoModel.delete(ID);
+        
+    } else if(action === "update") { 
+        tempArr[0] = Number(tempArr[0])
+        let ID = tempArr[0]
+        let status = tempArr[1]
+        Error.unknownIDError(ID)==false || Error.duplicatedStatusError(ID,status)==false ? Print.printError(errorMsg.unknownID_duplicatedError) : todoModel.update(ID, status)
+
+    } else if(action === "show") {
+        todoModel.show(tempArr);
+
+    } else if(action === 'undo') {
+        undo.undoModel(undoHistory[undoHistory.length-1]['model']);
+        redoHistory.push(undoHistory[undoHistory.length-1]);
+        undoHistory.pop();
+        
+    } else if(action === 'redo') {
+        redo.redoModel(redoHistory[redoHistory.length-1]['model']);
+        redoHistory.pop();
+
+    } else {
+        Print.printError(errorMsg.ELSE_ERROR);
+    }
+
+}
+
+
+ r.setPrompt('명령하세요 : ');
+ r.prompt();
+ r.on('line', (line) => {
+    
+     if(line === 'exit') {
+         r.close();
+     }
+
+     if(todoMain(line)) {
+        r.prompt()
+     }
+ })
+
+ r.on('close', () => {
+     process.exit();
+ })
\ No newline at end of file
diff --git a/oop/todoPrint.js b/oop/todoPrint.js
new file mode 100644
index 0000000..9b36317
--- /dev/null
+++ b/oop/todoPrint.js
@@ -0,0 +1,26 @@
+const ShowPrint = class {
+    printShowAll(todo, doing, done){
+        console.log(`현재 상태 : todo: ${todo}개, doing: ${doing}개, done: ${done}개`)
+    }
+    printShowElse(temp_length, temp){
+        console.log(`${this.value1}리스트 : 총 ${temp_length}건 : ${temp}`);
+    }
+    printAdd(name,id){
+        console.log(`${name} 1개가 추가됐습니다. (id : ${id})`);
+    }
+    printUpdate(targetName, status){
+        console.log(`${targetName} 가 ${status}상태로 변경되었습니다.`);
+    }
+    printDelete(targetName){
+        console.log(`${targetName} 가 todo에서 삭제되었습니다.`)
+    }
+    printError(errorKey){
+        console.log(errorKey)
+    }
+}
+
+
+
+module.exports = {
+    ShowPrint
+}