Yeonghan! Yeonghan, your next lecture video production comes before your health!!! Please hurry up and film the video and upload it to Inflearn!!! Just kidding ㅋㅋㅋ Thank you for organizing such great lecture content :) Usually, in the case of APIs that companies encounter, I coded mainly in the business logic area. So, I felt a bit uncomfortable because the code for interceptors, filters, validation, exception handling, etc. was readable but lacked depth. (For example, why did my ancestor implement it like this?? lol) However, this lecture helped me a lot because it explained everything from the very bottom. And the lecture is also fun :) I wrote a review and it seems very messy. Thank you :)