I only listened to the architecture part, but I felt that it was a really, really, really good lecture. I read many books, but I felt that there were conflicting parts in each book, or that there was no lecture or book that could completely cover all the books at once. This lecture was really helpful because it neatly explained the parts I was worried about, and I could feel the great inner strength of Mr. Woo-geun Kim. It was impressive, and I hope to listen to other lectures by Mr. Woo-geun Kim.