Let me start with a brief introduction. I am a 3rd year app developer working at a small SME. I am currently in charge of Flutter and Android development. I got to know Mr. Oh Jun-seok through YouTube. As a programmer, I have to be aware of trends and quickly catch them to make them my own. However, due to frequent overtime work and my laziness, I only code with the techniques I have used and learned. However, the teacher organizes issues and trends in the Android market quickly and easily through YouTube. I heard that you recorded a lecture on YouTube, so I am leaving a review after listening to the lecture. First of all, what was really good about this lecture was that you used the latest Android trends and JetPack-based libraries to teach the lecture. This may be my personal opinion, but I think that this is where developers are ranked. In my case, I studied app development for about 2 years before getting a job as an app developer. This is already 5 years ago. There is a clear difference between the way I learned coding back then and the way I code now. Technology is bound to develop. If I continue to develop while maintaining the technology from 5 years ago, the app will definitely run. However, I think my life as a developer is over. What's the use of an app that just keeps running? This is the strength of this lecture. I think that I can move up to a higher position only by flexibly responding to the latest trends and issues and developing myself. Thank you for such a great lecture, and I hope you will continue to provide better lectures in the future. I will end my review. Thank you.