In the night when the kingdom of Incantasi has been conquered by the tyrant Henry, Cassandra Monfort is born-a girl who could save the kingdom from the evil ruler's hands. When the seal appears on her twelfth year, her whole life changes. King Henry orders the execution of her parents, and it happens before her very eyes. But luckily, Cassandra is saved by a group of bandits who takes her in their care. She vows for revenge, an oath to make the tyrant pay for her parents' unjust death. Bryce, the leader of the bandits, hides her identity by making her dress up like a man and trains her to be a fighter under her new name, Miles. A plan is all she has. But things get shaky when she meets the Prince of Incantasi, Lancelot. The once driven Miles finds herself falling for the man who is the enemy's son. Will she choose her heart or the fate of the kingdom that lies in her hands?