We joined the 13th. Japan-Korea Joint Conference on Surgery for Cerebral Stroke held in Busan, Korea on September 23-24, 2016. Prof. Kuroda and Prof. Kuwayama gave the lectures on moyamoya disease and carotid artery stenosis, respectively. I could stay in Busan for only 20 hours, but really enjoy a stay in Busan with my Korean friends. The photo with Dr. Ahn from san Medical Center, Seoul.