Won, the crown prince of Goryeo, becomes best friends with his bodyguard Wang Rin. Their friendship is tested when they realize that they have fallen for the same woman.

Set in the Goryeo dynasty, it tells the story of a young and ambitious monarch Won (Im Si-wan) with a desire to conquer, and two people who shape his destiny; childhood friend Rin (Hong Jong-hyun) and a beautiful woman named San (Im Yoon-ah).—sharmaregan