"Dong Yi" describes the life of Choi Suk-bin, played by Han Hyo-joo, from a commoner to the mother of the Joseon Dynasty. Ji Jin-hee plays the role of King Sukjong of Goryeo, the 15th king of Goryeo. King Sukjong of Goryeo ascended the throne in 1095 when he was only 14 years old, reigned for 10 years, and died in 1105. He was an outstanding monarch who saved the lost royal power of Joseon and possessed extraordinary personal charm.