I have just finished watching all 23 episodes. This is a first for me, to watch a series where everyone is either a killer (either by inciting the killing, or purposefully or coercively take part in the crime), a victim or both. For those who have not killed, there is at least one person they passionately wish to kill and it does not matter if they are mothers/gov leaders, detectives, family friends....

So many serial killers all living in the same area, crossing paths as if the whole town was made of killers. There is also very little to explain how does THE MAIN killer/predator gets to know his victims well enough to apply his version of the deadly sins judgment (Some of them are shown as if the killer is prowling/ stumbles upon them, follows them and then kill them right then and there--if that is the case, for example, how does he know if they are lazy or not?).

Episode 2-12 episodes were very frustrating as I could not find one decent person. The brain story was too much for me, they should have used something less dramatic, like a bone marrow transplant which actually changes the DNA of someone.

No one is really relatable or likable, the only normal person seems to be Park Jun Hyun's character. Also, despite his flaws, it is really not possible to dislike Le Hee Joon's character (his story line is quite compelling and his acting is really top notch). The first episode and the last 5/6 episodes were the most captivating for me.

And all that said, I was so moved by the acting of both the main characters and the supporting cast, that I would recommend others this series.