This is the first lecture I've paid to attend, and I'm sorry to the instructor, but I'm a little disappointed ㅠㅠ The order of the class material PPT seems a little different from the lecture order, but it's not mentioned at all, and I couldn't even read what the notes were on the screen, and it was like doodling, so I didn't know what to do. It was good that the basics were covered, but as a listener, it felt like you weren't prepared (I'm sorry for saying this when you must have prepared hard). It wasn't the first time I studied it, but I started studying it again from the basics properly... It was hard to understand. It's very disappointing considering I paid to attend, but anyway, thank you for the lecture.