I agree with others who say that the content covered in the lecture is very good, but the lecture feels very unpolished. There are times when the flow is interrupted by parts that talk about other things or go around here and there, so even though the content is not difficult, I often get lost. I've listened to a lot of Mr. Kiseon's lectures, but since this lecture is the only one like that, I think it's because it was made at a time when people weren't yet familiar with online lectures, since it was one of Mr. Kiseon's early lectures. Even considering these things, the content of the lecture is very good. I recommend this lecture because it's one that you can't hear anywhere else.