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 theson 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 heloves, and comes into inner conflict.