While participating in international conferences, I began thinking about studying abroad. I decided to go to developed countries such as the U.S., Canada, and in Europe, to learn from the experts in hair transplant. I appreciate Dr. Harris, Dr. Heitman, Dr. Shapiro, Dr. Feller, and Dr. Rahal for welcoming and teaching me the basics. In particular, I would like to thank Dr. Rassman and Dr. Pak at the U.S. NHI New Hair for becoming my partners for life. I am deeply grateful to them.