The Beast Must Die
literal psychopath kang mu x brother seeking revenge kirin -kirin becomes kangmu's "partner" to infiltrate a secret high society boys club that gangraped his sister and drove her to suicide -initiation is having sex in front of the members -the members pull a bunch of shit b/c the head guy is in love w/ kang mu (try to gangrape kirin, use kirin for human hunting) -well shit happens and one guy kills another guy b/c he thought he had sex w/ his fiance -kirin suspects kang mu was the killer b/c he took pics of the body -turns out he wasn't "technically" the killer, but set up the paranoid delusional guy to kill the other guy as a way to save his cousin, the fiancee -2 more die, allegedly b/c kibum kills them -it was kang mu again, turns out he's a complete psychopath (dx'd) and manipulated everything -finally kills off the last guy by pushing him off a cliff -kirin knows that kang mu is a psychopath, but doesn't realize how far it went until he finds that kang mu actually knew his sister before she died and this whole thing was a setup -detective nam works w/ this sketchy PI from the US (hired by the last guy's mom) -once again everything is orchestrated by kang mu and the PI goes away for entrapment -kirin is basically the only thing preventing kang mu from becoming a serial killer, and they both know it -some further side stories as kang mu works as a forensic crime scene investigator and kirin works to keep him from killing
Gesshoku Kitan