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Eun-Soo (Lee Mi-Yeon) & Ho-Jin (Lee Eol) appear to be a happily married couple. Ho-Jin's younger brother Dae-Jin (Lee Byung-Hun) lives with the inseparable couple. One day, two seperate car accidents places both brothers in a coma. Only younger brother Dae-Jin awakes, leaving Eun-Soo to restart her life alone. Meanwhile, Dae-Jin's behavior begins to change, resembling Ho-Jin's mannerisms ...