Hello, I am Jeong-Hwan Cheon, a student taking Professor Jun-Seok Oh's course to learn Flutter. Professor Jun-Seok Oh's course explained in detail the process of developing a public mask inventory app and refactoring it by applying the MVVM pattern. I was able to learn how to use public information APIs through HTTP communication and utilize current location information. It also covered how to manage state using Provider and how to apply the MVVM pattern, which was very useful. The course explained the MVVM pattern in detail, which explains how to structure and maintain code easily. It also covered refactoring, so I was able to learn how to improve existing code. The course structure provides a balanced mix of theoretical and practical content, so anyone can understand it, but I had a hard time, so I tried to follow along. Professor Jun-Seok Oh explained the concepts easily and showed how to implement them while writing code. Through this course, I was able to acquire basic knowledge about patterns and refactoring used in practice. I think it is essential for growth as a developer. Thank you, Professor Jun-Seok Oh!