Work at the Woollim Police Department has always been slow. They haven't had an exciting case in years, and the most common thing they have to do on a day to day basis is giving out traffic tickets. But one day that all changes when a new case comes in- a murder. The murder of the president's son. The case is highly confidential, and is top priority. The case will test their limits, loyalty towards each other, and to themselves. Especially after they find out that the case is over jurisdiction line and they have to team up with the detectives of TOP Police Department. How far will they go to find the killer?

Woollim Police Department:

Byun Baekhyun:

- Captain

Lee Sungjong:

- Forensic Scientist

Woollim Police Detectives:

Kim Sunggyu:

- Partner of Nam Woohyun

Nam Woohyun:

- Partner of Kim Sunggyu

Jang Dongwoo:

- Partner of Lee Howon

Lee Howon:

- Partner of Jang Dongwoo

Lee Sungyeol:

- Partner of Kim Myungsoo

Kim Myungsoo:

- Partner of Lee Sungyeol

TOP Police Department:

Kim Rokhyun:

- Captain

Jang Hyukjin:

- Forensic scientist

 Police Detectives:

Lee Chunji:

- Partner of L. Joe

Lee Byunghun (L. Joe):

- Partner of Chunji

Changjo:

- Partner of Ricky

Ricky:

- Partner of Changjo

Bang Minsoo (C.A.P):

- Partner of Niel

Ahh Daniel (Niel):

- Partner of C.A.P

President's son:

Bang Yong Guk