Hello happy-kyul! First of all, thank you for leaving a valuable review. This was a lecture that quickly progressed by summarizing only the essential knowledge. I think happy-kyul followed along very well. It is also really difficult for me to take time to take online classes and study, but I can see happy-kyul's passion for learning. I hope happy-kyul, who is passionate, has a future full of good things and a career! 🎉