This is good but not great. The story is interesting enough, serial killer dramas are always interesting. Examining what makes people good or bad and why some people kill and how serial killers are made is something society in general is interested in. My issue isn't so much with the story or the acting, but the justification of the serial killers. (And there seemed to be an inordinate amount of serial killers around these people.) It felt as if we were being lead to have pity and understanding for the bad guys. The question of whether serial killers are born or made was asked at a basic level. They could have gone a lot creepier. But because it didn't go darker it made it a little easier to watch but possibly a smidge less interesting. It was a bit boring to me in places and didn't necessarily keep me desperate for more. But it was engaging.

The acting was a mixed bag. Seo In Guk did a great job of portraying realistic growth. His character is cold, intelligent, and brutally arrogant. The love story is very small but it seems an important part to the development of the ML's character. At first, the one-sided love of the FL is a little painful and a lot awkward. It's obvious that Lee Hyun has no feelings for Cha Ji An. I wasn't sure how it was going to develop but before I knew it I believed in the romantic relationship. Jang Na Ra did fine as Cha Ji An, she didn't blow it out of the water but she didn't stink up the joint either. Ironically, the creepiest and best portrayal for me was D.O. as Lee Jun Yung. I've only seen him in 100 Days My Prince and I hated it. But this was the perfect role for his stoic and handsome face. He was so creepy and completely believable as a psychopath. Choi Won Young's character is more pathetic and way less scary than D.O.'s which is a bit of a bummer. I'm not sure if that was a director's decision or the actor's choice. Between the two, I preferred D.O.'s characterization. Choi Won Young's facial expressions had me rolling and I don't think I was supposed to be laughing.

Music was meh. I don't remember it and I just watched it so neither good nor bad.

People are hating on the ending but it seemed like they were leaving it open for a second season. But since there hasn't been one yet, it feels like a nod to the end of Silence of the Lambs but less creepy. The ending wasn't really a problem for me; it seemed to suite the attitude of the show in general towards the bad guys.

It was enjoyable and I don't regret watching it but it isn't one that you have to go watch right now.