Hello, Choi Han-eol. This is Sohwakseong. First of all, thank you for taking our course. Looking at your course reviews, it seems that you are somewhat dissatisfied with some aspects. Was it inconvenient to teach using the provided course materials? If so, I would like to express my understanding regarding this matter. Our course is based on the publisher's books, but since it is an online course, we cannot cover all the contents of the books, we have created course materials for the lectures to ensure the most efficient learning and lecture production. We believe that providing course materials will enable more efficient and compressed learning than learning from books alone, so we are providing course materials. We decided on the direction of the course production based on the judgment that this qualification exam is more efficient for beginners to learn by grasping the context, learning the key theories, and then understanding the details, rather than simply reviewing the details one by one. We will think more carefully about it in the future revision to reflect the needs of various learners. Thank you for your valuable feedback.