Ballad of Seodong is a South Korean television series starring Jo Hyun-jae, Lee Bo-young, and Ryu Jin. It aired on SBS from September 5, 2005 to March 21, 2006 on Mondays and Tuesdays at 21:55 for 55 episodes. The period drama is based on Seodong-yo, said to be one of Korea's oldest folk songs and its first hyangga. According to the Samguk yusa from the Silla Kingdom, the song was written by Seodong, a commoner from the Baekje Kingdom.