Heukwahaneun Seobeu Namjuui Anaeramnida

A woman finds herself in the body of Pernia, the fiancée of Lucian, a man harboring demonic power capable of killing her. Her goal is to help Lucian confess his feelings to Estelle, the novel's heroine, to prevent his unrequited love from awakening the demon within him. Pernia takes action, from teaching Lucian to dance to inviting Estelle to her engagement, all in an effort to bring the two together. However, Lucian's attention begins to shift toward Pernia herself, raising unexpected complications.