I have no doubt about God Young-han. When I first saw the table of contents, I thought it was something I already knew, so I hesitated to take the class. However, as I listened to the previous classes, I felt that he was showing me a roadmap that would help me naturally understand how to use the knowledge rather than just teaching me the knowledge, so I decided to take the class after much consideration. I have no regrets. It's really great. If you're hesitating, I highly recommend taking the class.