Thank you so much, keulseok, for leaving such a precious review. As an instructor, I feel a great sense of reward knowing that the lectures are helping you in your process of preparing for the SQLD certification exam. SQLD is an exam where it is important to both understand concepts and develop a sense for solving problems, and I hope the lectures have been of some help in your preparation. I will sincerely root for you to successfully complete the rest of your studies and pass the exam on your first try. Thank you.