Ji Chang Wook will play the role of Emperor Soon Je of the Yuan Empire which is based in China and encroaches upon Goryeo territory. Though Soon Je is the eldest son of Myung Jong and thus holds the position of the eldest grandson, Soon Je lost his claim to the throne through the machinations of powerful courtiers and his younger brother was placed on the throne. Though still a youth, Soon Je is exiled to the Goryeo Kingdom. The youth survives this trying time while carrying a burning anger at his fate.
Ha Ji Won will play the role of Empress Ki of the Yuan Kingdom who was born in Goryeo Kingdom but married to Yuan Emperor Soon Je. Empress Ki will struggle with balancing the interests of her birthplace with the interests of her new home, and find herself torn between her husband and a new love interest.
Joo Jin Mo will play the role of King Chung Hye of the Goryeo Kingdom (after many battles, the Goryeo Kingdom becomes a tributary state of the Yuan Empire) who hopes to free Goryeo from the increasingly burdensome Yuan sphere of influence and falls for Empress Ki.
The 50-episode drama will premiere in October and will air on Mondays and Tuesdays.