Synopsis: Life is seemingly perfect for Eun-su, her husband Ho-jin, and Ho-jin's younger brother Dae-jin. But tragedy strikes one fateful day when two separate car accidents put both brothers into a coma. Ho-jin dies and Eun-su is left to restart life without her husband.
However, events take a strange twist as Dae-jin awakes from his coma and demonstrates more and more of Ho-jin's behavior, leaving Eun-su to question if her husband's soul is trapped in the body of her brother-in-law.