Hello, Jihoon Jang. This is Yunhee Song, who is conducting the "Easy and Fast Power BI Advanced 1 (Visualization and Power Query)" course. First, I'm sorry to hear that the lecture quality didn't meet your expectations. To prepare better lectures in the future, it would be very helpful if you could tell me more specifically which parts you felt were lacking. I know you're busy, but if you could take the time to share your feedback, I would gratefully accept it and work hard to make improvements.