Perfect. This drama reminds me of an anime called detective Q and another drama called voice. I like many detective story, so I am sure I will like this one.

this is what I like in this drama :
- I always amazed by Jang Hyuk's acting. In every drama or movie that he played, i always feel strange with his acting. especially his laugh. but after some minutes, I forgot about it and enjoy his acting very much.
- The main character is not weaker or more stupid than the main villain. I like when main character has ability same or more than villain so they can duel each other and not being played. Its better when both of them are mastermind who have plan with another plan and backup plan.
- I like the character. I dont hate any single character in this drama. especially the RIU's team member. I dont know if it because their acting or good script.
- I dont have problem with the twist. we know how korean make crime drama. the main villain is often from lawyer. forensic doctor, prosecutor, cop, or something like that. but this drama make a cool appearance of the villain.

there are too many serial killer in this drama. yeah, it is not realistic. But I don't care with it. this is how crime or detective drama works. Do you know detective conan has more than 1000 chapter and sometimes 1 chapter has more than 1 murder case? Kindaichi? Q? Tunnel? Voice? Hello Monster? they are the same. There will be so many killers in detective or crime drama. That's how it works.