Yeonhwa, who was betrothed from a young age and was to marry Hyun, her unrequited love, gradually felt a sense of déjà vu after the wedding, seeing Hyun's appearance become too different from the Hyun she knew. She then discovers that the soul of a man named Mooyoung has entered Hyun's body.

Feeling confused about when Hyun became Mooyoung and whether the Hyun she knew truly existed, Mooyoung's obsession does not end, even as he watches Yeonhwa suffer.

Meanwhile, Yeonhwa also learns the reason why the fatal illness she almost died from long ago has improved...

A psychological thriller of two souls trying to claim one body and one woman, a poignant, high-level romance.