Hello, Younghan-nim! All the lectures I've taken so far have been a great help in practical work, but this JPA Advanced Part 3 lecture particularly resonated with me. I frequently use lambda and thought I was quite proficient with it... but listening to this lecture, I realized I was only at the 'level of knowing how to use it,' and I felt embarrassed. Learning such in-depth content, I feel like I've gained a lot. I've purchased and taken almost all of Younghan-nim's lectures so far, and what always impresses me is "So what was inconvenient, and why did this concept emerge?" the fundamental awareness of the problem and the way it flows, which you naturally convey with example code. Understanding how concepts originated and in what situations they became necessary, I was able to experience 'internalization' beyond mere knowledge transfer. Now that all the lectures are finished with only Advanced Part 2 remaining, I feel a bit sad and regretful on one hand. I will look forward to hopefully encountering the database lecture you mentioned someday. Thank you very much for creating and sharing such dense and fruitful lectures. And finally, if I have one personal wish... The stories of past practical incidents and accidents you share occasionally during lectures, such as issues related to parallel processing or threads, I think it would be very interesting if you could elaborate a little more on those experiences. When I hear you say, "A really big accident happened because of incorrect parallel processing," I wonder, 'What kind of accident could that have been?' Once again, thank you very much for the great lectures. I will continue to support you in the future!