Death Loop: Who Is The Killer

Synopsis

I usually fell into a deep sleep right after saying goodnight to Edwin, but tonight was different. I lay there, eyes shut but wide awake. When I opened my eyes, a row of comments scrolled across the ceiling. [Don't sleep! The killer is already outside your door.] [Is this the second male lead's first love who died young?] [Yeah, that's her. The killer is her neighbor upstairs.]