When Kyungsoo decided to escape the cold for a night in an old hotel, he was not asking to be visited by a ghost and forced to wreak vengeance on his killer. But fate had a way of not working as Kyungsoo planned, and Kai never listens to pleading. 
  
  Kai whisks Kyungsoo into the past, where he instructs him to kill a man named Sehun. But Sehun is too young, too innocent - can Kyungsoo possibly kill him? Or would his fear of Kai drive him to it in the end? 
  
  Or, perhaps, his love for Kim Jongin?