Wow, it seems like I've really grasped the concepts that I didn't know about and used in practice. I used to not understand the difference between when to use @ModelAttribute and when to use @RequestBody, but I understand it very clearly now!!! In particular, the part about cases requested by clients was always so confusing, but I understood it clearly through the lecture!!! Before taking the lecture, I thought there were so many cases, but there were only 3? Haha And every time you lecture, you always say, "I'll make sure you understand it clearly," "I'll get to the point," etc. of affirmation. I think those are more encouraging to the learners!! Thank you so much for the great lecture!!