Composer
Director
Screenwriter
Main Role
- Jang Hyuk Main Role
- Choi Soo Young Main Role
- Jin Seo Yun Main Role
Support Role
- Jang Hyun SungChoi Hyung Pil [Chief / Senior superintendent]Support Role
- Ryu Seung SooYang Man Soo [Veteran detective at RIU]Support Role
- Shin Soo HoJang Tae Sung [Detective at RIU]Support Role
- Ha Sung KwangCha Man Suk [Soo Young's father]Support Role
- Eum Moon SukGang Dong Shik [Soo Young's colleague at Patrol division]Support Role
- Yoo Hee JeLee Ji Min [Detective at RIU]Support Role
- Kim Dong GyunPark Sun Woong [Mucheon Metropolitan Police]Support Role
- Lee Joong Yul[Hongwoon Police Station Chief]Support Role
- Choi Jae Sub[Medical examiner]Support Role
- Choi Hyung JooKim Yo HanSupport Role
Guest Role
- Lee Ga Hyun[Soo Young's friend] (Ep. 1)Guest Role
- Shin Hyun JongKim Sung Jin [Police commissioner] (Ep. 1)Guest Role
- Kwon Oh Jin[Sheep hunter] (Ep. 1-2)Guest Role
- Kim Soo InCha Soo Young [Young] (Ep. 1-2, 4, 11)Guest Role
- Kim Heung RaeGang Seung Hwan [Murder Culprit] (Ep. 1-3, 6)Guest Role
- Bae Jung Hwa[Soo Young's mother] (Ep. 1, 4)Guest Role
- Song Young KyuNa Jun Suk [Profiler] (Ep. 1-4)Guest Role
- Kim Young WoongChief Bang [Section chief] (Ep. 1, 6-7, 11)Guest Role
- Kim Ba DaShin Gyung Soo (Ep. 1-6, 12)Guest Role
- Moon Sun YongKim Sang Gil [Young] (Ep. 1, 12)Guest Role
- Lee Gyu Bok[Investigation Team 2 detective] (Ep. 2-4, 6)Guest Role
- Seo Dong Gab[Investigation Team 2 Head] (Ep. 2-4, 6, 14-16)Guest Role
- Lee Shi WonHan Yi Soo [Hyun Jae's fiancè] (Ep. 2, 5, 15)Guest Role
- Ha Jung Min[Woman walking dog] (Ep. 3)Guest Role
- Kim Seo HaJung Chan Goo [Veterinarian / Culprit] (Ep. 3-4)Guest Role
- Lee Hyun KyunDoctor Ahn (Ep. 3, 5)Guest Role
- Park Ji HoonKim Myung Woo [Culprit] (Ep. 4)Guest Role
- Kim Jae Cheol[Live TV Show director] (Ep. 4)Guest Role
- Jo Young JinJo Sang Gyung [Commissioner General] (Ep. 4)Guest Role
- Jang Tae Min[Inn manager] (Ep. 5, 8)Guest Role
- Kim Tae YulGil Hyun Soo [Mute kid] (Ep. 6-7)Guest Role
- Jo Wan KiNoh Sang Chul [Paedophile] (Ep. 6-8)Guest Role
- Baek Ji WonKim Na Hee [Lawyer] (Ep. 6-8)Guest Role
- Jin Yong Wook[Min Joo Hyuk's father] (Ep. 7)Guest Role
- Ha Hoe JungPark Jung Woo [Culprit] (Ep. 7)Guest Role
- Baek In KwonKim Pan Geun [Gangster] (Ep. 8)Guest Role
- Joo Jin MoHa Tae Shik [Gang leader] (Ep. 8-9)Guest Role
- Yoon Jong SeokJoo Sa Gang [Witness] (Ep. 8-9, 15)Guest Role
- Kim Han JongCho Bang Man (Ep. 8-11)Guest Role
- Park Yong[Police director - 5 years ago] (Ep. 9)Guest Role
- Park Boo GunChoi Doo Man [Gang leader] (Ep. 9)Guest Role
- Seo Eun WooLee Yoon Jung / Lee Yoo Mi (Ep .9-10)Guest Role
- Shin Seung HwanUhm Soo Tak (Ep. 9, 11)Guest Role
- Lee Ki HyukWon Se Yoon [Managing Partner of Wonseo Group] (Ep. 10)Guest Role
- Choi Ji Yeon[Yooseong Hospital Nurse Receptionist] (Ep. 10)Guest Role
- Jung Soo KyoMin Hyung Ju [Se Yoon's secretary] (Ep. 10)Guest Role
- Park Ya Sung(Ep. 10)Guest Role
- Kang Ae ShimChim Sa Bong / Bong Yeon Ja [Financial broker] (Ep. 11-12)Guest Role
- Yoon Sang HwaKim Sang Gil [Hit-and-run culprit] (Ep. 11-12)Guest Role
- Heo WoongLee Jong Soo (Ep. 11-13)Guest Role
- Kyung Sung HwanKim Jung Hwan / "Dominic" (Ep. 12)Guest Role
- Lee Kwang Se[Orphanage director] (Ep. 12)Guest Role
- Oh Cho Hee[Sang Gil's wife] (Ep. 12)Guest Role
- Jang Ji HooKim Jung Hwan (Ep. 12-13)Guest Role
- Oh Ja HunShin Gyung Soo [Child] (Ep. 12-13)Guest Role
- Lee Ga KyungLee Ji Sun [The Guy's victim] (Ep. 12-14)Guest Role
- Kim Jung JinShim Soo Hyun [Detective] (Ep. 13)Guest Role
- Yoo Yong[NFS control room] (Ep. 13)Guest Role
- Oh Ki HwanSeo Gi Suk (Ep. 14)Guest Role
- Kim So Yang[Prisoner transport officer] (Ep. 15)Guest Role
- Kim Mi Ra[Doctor] (Ep. 16)Guest Role
- Kim Sun Kyung[Panel woman]Guest Role
- Kwak Na Yeon[Lawyer]Guest Role
- Song Young Ah[Employee]Guest Role
- Nam Hee Soo[NFS staff]Guest Role
- Ahn Joong KwonReporter JoGuest Role
- Kim Wang Do[Criminal Investigation Team]Guest Role
- Jun Jung Il[Villager]Guest Role
- Hwang Yun Seon[Press conference reporter]Guest Role
- In Ah Guest Role
- Lee Chang Won Guest Role
- Lee Seung Jin Guest Role
- Lee Da Yeon[Nurse]Guest Role
Unknown
- Kim Soo Yeon Unknown
- Ahn Jong Min Unknown
- Yoon Se Eun Unknown
- Jin Jae Hee Unknown
- Kwon Tae Jin Unknown
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