This review might and will contain spoilers: This drama has a lot of violence in it. But it's a crime drama, violence needs to be a part of it. I'll not focus on the plot this time. It was ok, almost brilliant. There weren't black holes, everything fit perfectly together so I have nothing to complain about the plot. The most interesting thing about this drama is its characters. Some of them were written really well, some of them were too plain for me to like them. Let's start with Jin Hyeok. A pretty skillful cop, he chases criminals and murderers like a crazy dog chase a car. Clever, never disappointing when it comes to his way of dealing things and troublesome situations. He seeks revenge toward the psycho who killed his wife, he's a protecting father yet his son has never been a pain in the ass (Like SY has been in Duel). At first he can't team up with his new team, he just wants to do his job alone like a lone wolf. But after some episodes we see that he's actually stronger while being in a team. Kwoo Joon is the tough female cop that works as his sidekick. Both seeking for the murderer who killed their darlings, Kwoo Joon is the brain of the team. She has a really good hearing, almost a supernatural power I might say. She knows how to handle things, but, most of all, she knows how making a team work. She's not the best female character I have ever seen in Kdramas but she was a really strong woman. REASON TO WATCH IT. The villain is one of the most interesting and creepy villain I ever saw. I'm not just talking about how he kills people, a really gruesome way, but I really enjoyed his personality and his background story. A villain is a villain and a well made villain doesn't need to have a sad background story to being with. Taegu grew up with a mental illness. His father didn't want to cure him so his father made TaeGoo become that kind of adult. I really enjoyed the way they killed him off. Maybe it was too unrealistic, but he was killed the way he used to kill people. And, in the end, he was scared. Great drama, I'll give it a 7.5 out of 10.