Knife and Flower, an action/spy/romance drama, is set in the Koguryo period. It is about how Moo Seol, the daughter of King Young Ryu, falls in love with Yeon Choong, the child 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.
Yeon Choong, was born between a father of noble blood and a servant mother.
