I feel so fortunate to have found such a great lecture even now. This is a lecture that I am truly so grateful for. I think that the 19,800 won is definitely worth it. I recommend this lecture to the following people: 1. People who have seen the concept roughly but still can't get the hang of it 2. People who want to understand the concept of object orientation 3. Complete beginners who don't know anything but still want to learn I divided it into 3 categories above, but I think it's a good lecture for anyone. I'm really grateful for the great lecture again, and I'll finish the lecture and leave another review as a completion review~