Thank you, Got Young-han. I think you saved a junior developer who was despairing that development wasn't his path. I found enums and exception handling difficult, but I was able to understand them more easily thanks to this lecture. The 'Fun Problems and Solutions' made it easy to review. I think it would be good to add one or two more problems per chapter in the next lecture. And you always give lectures with a bright smile, so I was able to regain my energy when I was tired. Thank you!