After barely surviving a violent attack by an elusive serial killer, crime boss Jang Dong-su finds himself forming an unlikely partnership with local detective Jung Tae-seok to catch the sadistic killer simply known as K.
110 min.
Lee Won-tae
| Ma Dong-seok | Jang Dong-su |
| Kim Moo-yul | Jung Tae-suk |
| Kim Sung-kyu | Kang Gyeong-ho |
| Heo Dong-won | Choi Moon-sik |
| Yoo Jae-myung | Heo Sang-do |
| Lee Seo-hwan | Choi Jeong-gyu |
| Oh Hee-jun | Kim Dong-chul |
| Kim Gyu-ri | Cha Seo-jin |
| Yoo Seung-mok | Ahn Ho-bong |
| Ryu Tae-ho | Mr. Ahn |
| Cha Soon-bae | Judge |
| Jeon Bae-soo | Chief of the Criminal Department |
| Lee Eun-saem | Student |
| Yoon Yeong-gyun | Agent |
| Bae Min-jun | Mercedes-Benz Man's Son |
| Moon Soon-ju | Gositel Owner |
| Lee So-jin | Student |
| Woo Kang-min | Ha Moo-young |
| Park Bo-kyung | Victim's Wife |
| Kim Yoon-sung | Bae Soon-ho |