Two years after EXO disbanded, the big bosses of SM Entertainment call them to reunite and do a reality series set in an isolated island about their life after being part of the popular boy band. The boys have mixed feelings in coming back together, stemming from the fact that their differences have never been resolved.
The set, the lights, and the cameras are ready, but the filming seems to be getting nowhere with the boys starting arguments and fights with one another. Then, after shooting the first episode, one member is dead, leaving behind a bloody handkerchief with a chilling message, “One by one.” As they attempt to call for help, they discover that the film crew is gone; the phone lines dead, their cell phones missing, and no boat to take them out of the island.
With the killer in their midst, how will they escape and survive? Or what if…the killer is among them?