After receiving an imperial decree to become the crown prince's wife, despite rumors of his madness, Eunrin is confined to the darkest, most secluded part of the palace, the Northern Palace. Resolved to face death, she chooses instead to follow her heart toward Doha... "Since I became a woman because of you, please make me your man, milady." A secret romance blooms in the deepest part of the palace between Doha, the crown prince hiding his identity, and Eunrin, a fallen noblewoman.