Park Eun-ha, a modern-day woman, dies and wakes up as Raeliana McMillan, a minor character in a novel who is destined to be murdered by her fiancé. To escape this grim fate, she strikes a deal with the powerful Duke Noah Wynknight, proposing a six-month contract engagement in exchange for his protection. Raeliana uses her knowledge of the original story to navigate the treacherous political landscape of the Duke's estate. As the two spend time together, the cold and calculating Duke finds himself increasingly drawn to Raeliana's wit and unpredictability. However, the original plot of the novel is not so easily discarded, and Raeliana must contend with hidden enemies, magical mysteries, and the growing romantic tension between her and the Duke, all while trying to ensure she survives long enough to find a way back to her own world.