Originally, this technology was used, but now, for various reasons, this technology is used. It seems like a really good lecture that explains it in order. I think it's easy to remember because it's explained in a flow. There were too many lectures, so it was hard to follow, but I felt like the teacher wanted to teach me more, so I tried hard to follow! I'm so grateful for providing such a great lecture, and I will diligently take the remaining lectures!! Instructor Kim Young-han is the best!!