 As an actor he came to prominence with his leading roles in the historical dramas "Damo" (2003), "Yi San" (2007), "Gyebaek" (2011), and the contemporary drama "Marriage Contract".Lee Seo-jin made his acting debut in 1999 in the television series "House Above the Waves".After several supporting roles on TV, he rose to fame in the 2003 hit period drama "Damo", followed by the also popular contemporary drama "Phoenix" in 2004.