The male lead, a hybrid of intertwined vampire and werewolf bloodlines, and the heroine, who is seeking the truth about her mother, break into a secret chamber in an ancient castle and uncover that the thousand-year war between the two races is a curse cast by a human witch — only the willing union of the two bloods can break it. From suspicion to fighting side by side, the two confront fate and the enmity between their clans.
