Yun Chun-sang (also known as Yun Junsang), born November 20, 1987 is a Korean 9 dan pro (promoted 2011-09-28). He was a student of Kweon Kap-yong and became 1p in 2001.
In the 14th Kiseong title (2003) he has risen all the way to the 3-game challenger final against Cho Hun-hyeon, which he lost 2 games to 1. Defeated Lee ChangHo for the 50th Kuksu title on March 16, 2007. This was Yun's first title.
See Favorite Moment 6 for an analysis of game 4 of the 50th Kuksu title.