Ju Ji Hoon (Also romanized as Joo Ji Hoon) is a South Korean actor. His first leading role was as Crown Prince Lee Shin in 2006 television series Princess Hours. His other notable works include films Antique in 2008 and as the future Sejong the Great in I Am a King in 2012. Ju debuted as a model, in advertisements for clothing brands such as Calvin Klein, Levi's and Reebok. Ju's debut drama was Old Love, but it was in 2006's Princess Hours, that he was recognized as an actor, for which he won Best New Actor at the MBC Drama Awards. On February 2, 2010, Ju enlisted in the Republic of Korea Army to serve his mandatory military service. Ju was discharged on November 21, 2011.