Hello Hye Woo! There have been inquiries about the lecture deadline since the beginning of the lecture. We also feel sorry because we know that there are people who want to review and listen to it. ㅜㅜ However, there are definitely advantages to limiting the lecture deadline, as some people complete the course quickly. (The completion rate of SQL lectures with a limited course deadline is much higher than other lectures!) This is a decision we made after comparing various pros and cons, so please understand. On the other hand, for lectures such as the Advanced SQL class, which have a lot of content that is only provided in our lectures and have high difficulty levels that you will want to come back to listen to later, we have an unlimited course deadline, so please keep that in mind :) Thank you for your review!