A massacre wipes out the pureblood werewolf clan, and Irene survives only because her dying mother hands her the Pureblood Holy Stone. Her mother urges her to hide her gender and live on to take revenge. Irene cuts her golden hair, binds her figure and enters the royal court as the knight Evan. On a night of the blood moon, a chance encounter forges a fated bond with Rex, the tyrannical Wolf King.
Rex is tormented by a curse that unleashes his wolf frenzy under the full moon, and he discovers that Irene's bloodline can calm it. While serving him as a male knight, she shows remarkable combat skill in one crisis after another and earns the Wolf King's trust. The closer they grow, the harder it becomes to keep her secret and her vengeance apart.
