Career
He is a two-time Olympian (1996 and 2000), and a double medalist at the Asian Games (1994 and 1998). Woo started his competitive swimming, as a 16-year-old South Korean teenager, at the 1994 Asian Games in Hiroshima, Japan. He helped the South Koreans earn a silver medal in the 4×200 m freestyle relay with a time of 7:33.61.
Woo"s Olympic debut came at the 1996 Summer Olympics in Atlanta.
At the 1998 Asian Games in Bangkok, Thailand, Woo added a bronze medal to his collection for the South Korean swimming team in the 4×200 m freestyle relay. He also attempted for his first individual medal in the 400 m freestyle (4:0066), but missed the podium by 0.22 seconds behind Hong Kong"s Mark Kwok.
Woo competed only in two swimming events at the 2000 Summer Olympics in Sydney. He posted FINA B-standards of 1:53.44 (200 m freestyle) and 3:59.35 (400 m freestyle) from the Dong-A Swimming Tournament in Ulsan.
On the first day of the Games, Woo placed twenty-seventh in the 400 m freestyle.
He held off his rival Kwok by almost half the body length to lead the second heat in a lifetime best of 3:58.31. The following day, in the 200 m freestyle, Woo placed twenty-ninth on the morning prelims. Swimming in heat three, he came up short in second place by 0.27 of a second behind 17-year-old Damian Alleyne of Barbados, breaking a South Korean record of 1:53.02.