Thank you, Younghan, for always giving such helpful lectures with sincerity. I have taken many lectures with Younghan, starting from the Spring introduction!! I was a college student and didn't know how to study, but thanks to Younghan, I was able to find my direction. Thank you so much. All I can do is pay for the next lecture^^ I will continue to ask for your help in the future ㅎㅎ I want to continue studying with Younghan even after I get a job~