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Brothers Ho-jin (Lee Eol) and Dae-jin (Lee Byung-hun) have such a close relationship that they remain roommates even after Ho-Jin marries Eun-su (Lee Mi-yeon). When the brothers experience simultaneous tragedies, Dae-jin awakes from a coma claiming to be Ho-jin. While Eun-su is skeptical at first, she recognizes her husband's speech patterns and personality traits in Dae-jin and struggles with the possibility that Ho-jin's spirit has possessed his brother's body. Wikipedia