A drama set in the Goguryo period. It is about how Moo-young (Kim Ok-bin), the daughter of King Young-ryu, falls in love with Yeon Choong (Uhm Tae-woong), the son of Yeon Gaesomun had with a concubine. But Moo-young debates whether she should have her revenge, as Yeon Gaesomun is the man who killed her father. Meanwhile, Yeon Choong as the son of a noble blood father and a servant mother, despite his talent, he finds he cannot rise higher in rank due to the fact that he is a concubine′s son. He is later ordered by his father to kill the person he loves, and comes into inner conflict.