An arrogant noblewoman, confident in her beauty and worth, is forced into a political marriage with her first love. When she reunites with him, he has become cold and cruel and even keeps a “lover” in his home, leaving her humiliated and isolated. Determined to reclaim her pride, she plans revenge by blackmailing that lover, who is secretly hiding a dangerous truth. As they work together, their relationship shifts from a deal into something genuine, but when she faces a near-death crisis, the lover saves her by sealing a vampire blood contract that binds their lives together.