Actually, I took the class just by looking at the teacher's resume. However, I felt uncomfortable because most highly educated people were not humble. But instructor Choi Bong-hwan answered my questions as quickly as possible, and I was impressed by his efforts to teach me even a little. He explained the content easily, so I was able to follow along well! I'm going to listen to the mock hacking lecture and have fun! Thank you for your hard work :)