Nearby police stations located in the Seoul districts of Mapo and Seodaemun are usually compared to each other and, consequently, has developed a rivalry. The chief at the Mapo police station is Hwang Jae-Sung (Park Joong-Hoon), who is fearless when it comes to catching criminals & uses any means necessary. To top the Mapo station, the Seodaemun police station appoints its new leader Jung Wei-Chan (Lee Sun-Gyun). Jung Wei-Chan graduated from the prestigious police academy.An award for "officer of the year" is given out to the officer able to apprehend the most criminals. The award also comes with a 30 million Won cash prize.Hwang Jae-Sung wants to receive the award as he wants a promotion and did not graduate from the police university. Jung Wei-Chan also badly wants to win the award for the prize money involved - his girlfriend is pregnant. For this award the two rivals compete even more fiercely. A serial rapist case then occurs causing both stations to work together. The outcome hangs in the air ...