Existing complex and difficult picture apps. So when I found an easy app, there were a lot of apps that had no basic functions and couldn't decide the color. I thought about my drawing board! "What should I do with the existing drawings so that users can do it comfortably?"" I only added key functions. If you want to make a mistake or draw again? It's a function of rewinding and initializing. What color do you want? Designating the background color and pen color will make it easier. If you want to erase it? Eraser function. If you don't like the thickness of the pen and eraser? Pen eraser thickness control function. What if you want to save my drawing? Save button. Enjoy it comfortably with simple and comfortable manipulation and simple functions! It's not hard!