You Seung hun

You Seung-hun (also Yu Seong-hyeon, Korean: 유 승현; born June 28, 1983) is a South Korean former swimmer, who specialized in breaststroke events. He shared bronze medals with Sung Min, Jeong Doo-Hee, and Park Tae-Hwan in the 4×100 m medley relay (3:41.33) at the 2006 Asian Games in Doha, Qatar.

You qualified for the men's 100 m breaststroke at the 2004 Summer Olympics in Athens, by clearing a FINA B-standard entry time of 1:04.28 from the Dong-A Swimming Tournament in Seoul. He blasted a South Korean record and a personal best of 1:03.56 to lead the third heat by 0.28 of a second ahead of Chinese Taipei's Chen Cho-Yi. You failed to advance into the semifinals, as he placed thirty-first overall on the first day of preliminaries.