Ah! I'm sorry for not communicating well with you through Q&A. If you have any questions or need anything while taking the lecture, please leave an email at [seonsin25@naver.com] and I will respond right away. After reading the post you left, I went to the question management section just in case, and I saw that the AI answers were not properly checking the questions I couldn't answer. Thank you so much for the good check. Have a happy week~^^