Kate, a princess priestess, gains the power of the original vampire to protect her kingdom during war. To prevent future threats, she enters a contract marriage with Luka, the powerful king of a great empire, offering her strength as a bargain. However, Luka despises vampires and treats her coldly. On their first night, Kate loses control to her vampire instincts after sensing his blood, leading to an intense and instinct-driven encounter. Their relationship begins unwillingly, raising the question of whether love can grow between them despite rejection and conflicting natures.