Cruelly betrayed by her royal fiancé, a noblewoman is stripped of her title, exiled from her family, and forced into ruin. Desperate for revenge, she makes a calculated deal with a neighboring empire's tyrannical ruler, offering to fulfill his desires in exchange for his power. However, their strictly business-like alliance quickly blurs when the ruthless Emperor starts calling her to his bed every night, proving himself to be more of a fiercely devoted "mad dog" than a cold-hearted tyrant.