In 1983, high school teacher Ji-hwan is attacked by a pickpocket. In 2015, homicide detective Gun-woo is shot during a chase and loses consciousness. Both men are taken to the same hospital in different time periods, and both their hearts stop and miraculously start again at the same time. A mysterious force binds them together, allowing them to see through each other's lives in their dreams. Soon realizing that the woman they love strikingly resemble each other and that they are in fatal danger, the two men must team up to trace the past and change her destiny. Written by CJ Entertainment

A woman is attacked by Internet users after posting provocative remarks online. Using her personal information, they go to her place but what they find is her body; she took her own life. Who made her kill herself? Or, was she killed by someone else?