I only listened to 50% of it, but it was good because I could easily understand the overall architecture while simply debugging a huge amount. Of course, I think it would be better to follow along in the middle. There are parts that go by too quickly, so if you don't understand for a moment, I think you will definitely understand if you take your time and try it out yourself. (I think you should definitely know Java and SPRING to some extent.) I was worried because there were people who said it was good and people who said it was bad, but I think I will definitely get more out of it. I first started with Ki-seon's lecture on security, and I think I will pay for the next lecture as well (It's too expensive for me though.. ㅜ)