Date of Birth: 
About You Seung-hun
- You Seung-hun (also Yu Seong-hyeon, Korean: ? ??; 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.
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