"Our ages are different, and the places where we live are different, too!" 'Han Se Jin', 28, Suwon 'Lee Dong Hyeok', 48, Daejeon 'Jo Hye Rin', 19, Seoul The three people, who have difficulty finding their common ground, open their eyes in an unknown space. Who, why, how where they locked up here? They can only escape if they find their lost memory!