I'm a huge fan of Jang Hyuk, I think he's an incredibly talented and unique actor who is fun to watch even in mediocre dramas. But this show did him in. He tried, he really did, but this honestly is in the running for the worst writing ever in a drama. Nothing makes sense at all. It's the worst run hospital in the world, there's no way it wouldn't be shut down not just because of all the murders but because of the unprofessional staff who stand around in the hallways gossiping even when a patient is bleeding out in front of them. The head of the hospital is basically a serial killer and openly admits it to one of his direct reports who doesn't report him to the police even though one of his patients is a cop and the female lead. And speaking of the FL, she's a traffic cop but somehow has the ability to barge into an unlocked interrogation room and interrupt a murder investigation. The writer should've made the character a detective to begin with, there's literally no reason for her to start out as a traffic cop. The only bright spot, at least at first, was Jang Hyuk doing his best to give his sociopathic character some depth and nuance. But he gave up after episode 5 and went for scenery chewing and who can blame him.