Ryu Su-young (Eo Nam-seon) is a South Korean actor. He made his first appearance on television as a college student on a cooking show in 1998, then starred in the controversial film Summertime (2001). This was followed by supporting roles in TV dramas such as Successful Story of a Bright Girl (2002), Save the Last Dance for Me (2004), and Lawyers of the Great Republic Korea (2008), as well as leading roles in 18 vs. 29 (2005), Seoul 1945 (2006), and Bad Couple (2007). For his mandatory military service, Ryu was a member of the Seoul Metropolitan Police Agency from 2008 to 2010. After his discharge, Ryu returned to television in 2011 in the romantic comedy My Princess, and the popular family drama Ojakgyo Family. In 2013, he joined the reality/variety show Real Men, in which male celebrities visit army bases and experience daily life there. He also played a detective chasing a fugitive in Two Weeks (2013).