[2] He represented his nation South Korea at the 2008 Summer Olympics, and has won a career total of four medals (one silver and three bronze) in a major international competition, spanning the 2002 Asian Games and the 2005 East Asian Games.

[3][4] Yoo is also a member of the swimming team and a graduate of physical education at Seoul National University.

[1] Yoo competed for the South Korean swimming team in the men's 200 m butterfly at the 2008 Summer Olympics in Beijing.

[3] Leading up to the Games, he topped the field with a time of 2:00.77 to make the FINA B-cut at the Dong-A Swimming Championships in Ulsan.

[5] Rallying from sixth at the 150-metre turn in heat two, Yoo put in a late surge on the final lap to edge out the frontrunners Douglas Lennox-Silva of Puerto Rico and Vladan Marković of Serbia by almost a full-body length for the fourth spot in 2:01.00.