Sorry, I didn't know that Korean taught advanced algebra. But from his learning experience, we can see that he has a high talent in mathematics and a solid foundation. He has been interested in mathematics since he was a child and has always shown excellent results in his studies. During his doctoral studies in Peking University, he studied under Academician Tian Gang and Professor Xu Chenyang, specializing in algebraic geometry and algebraic number theory. Therefore, it can be inferred that his teaching in advanced algebra may also be very deep and level.