Director
Screenwriter
Main Role
- Lee Dong Wook Main Role
- Wi Ha Joon Main Role
- Han Ji Eun Main Role
- Cha Hak Yeon Main Role
Support Role
- Sung Ji RuKwak Bong Pil [Anti-corruption chief]Support Role
- Cha Shi WonYang Jae Seon [Team 2 inspector, Anti-Corruption Investigation Div.]Support Role
- Lee Jin HongLee Jin Hong Yang Jae Seon [Team 2, Anti-Corruption Investigation Div.]Support Role
- Lee Hwa RyongKim Kye Shik [Team 1 Leader, Narcotics Crime investigation]Support Role
- Shin Joo HwanHeo Jong Goo [Narcotics Crime Investigation, Team 1]Support Role
- Jo Dong InJung Chan Ki [Narcotics Crime Investigation, Team 1]Support Role
- Lee Seung HeonKim Kyung Joon [Narcotics Crime Investigation, Team 1]Support Role
- Lee Sang HongDo In Beom [Munyang Police, homicide detective]Support Role
- Kim Hi Eo RaBoss Yong [Drug gang head]Support Role
- Won Hyun JoonAndrei Kang [henchman]Support Role
- Kang Ae ShimSeo Seung SookSupport Role
- Kim Dae GonRyu Dong Yeol [Soo Yeol's elder brother]Support Role
- Im Ki HongAssemblyman Do Yu GonSupport Role
- Park Se JoonNam Eun Seok [Prosecutor trainee]Support Role
- Choi Kwang JeYum Geun Soo [Heart Mender Clinic]Support Role
- Han Ki JoongCommissioner Kim Sung HoSupport Role
- Yoo Jung HoJu Dae WonSupport Role
- Jung Sung IlShin Joo Hyuk [Dream Youth Shelter therapist]Support Role
- Kim Jung HoonJeong Il SuSupport Role
Guest Role
- Han Sang Chul[Fight spectator] (Ep. 1)Guest Role
- Ji Sung Geun[Apartment building staff] (Ep. 1)Guest Role
- Choi Yi Sun[Bathhouse cashier] (Ep. 1)Guest Role
- Kim Jae ManKim Dong Gyun [Police officer] (Ep. 1)Guest Role
- Nam Jung Woo[Police officer] (Ep. 1)Guest Role
- Lee Jae Eun[Landlord] (Ep. 1)Guest Role
- Lee Joong Yul[Apartment security guard] (Ep. 1)Guest Role
- Kang Jung Im[Yoo Na's neighbor] (Ep. 1)Guest Role
- Park Yong[Disciplinary hearing officer] (Ep. 1)Guest Role
- Park Sang Hyuk[Disciplinary hearing officer] (Ep. 1)Guest Role
- Park Seon JooMrs. Do (Ep. 1)Guest Role
- Yu Seung Il[General contractor] (Ep. 1-2)Guest Role
- Yoon Tae In[Detective] (EP. 1-2, 4)Guest Role
- Lee Seo AnJung Yoo Na (Ep. 1-4)Guest Role
- Kim Si HaJung In Seon [Yoo Na's daughter] (Ep. 1-2, 4)Guest Role
- Lee Joo HyunTak Min Soo (Ep. 1, 4-5)Guest Role
- Lee Kyung WookShim Sang Ho (Ep. 1, 5-6)Guest Role
- Kim Moon Ho[Street cleaner] (Ep. 2)Guest Role
- Seol Chang Hee[NFS technician] (Ep. 2)Guest Role
- Park Yoo Mil[Dong Yeol's girlfriend] (Ep. 2)Guest Role
- Lee Dong Kyu[TVC reporter] (Ep. 2)Guest Role
- Im Sung JaePresident Ma [Mobile funeral home boss] (Ep. 2-3)Guest Role
- Kim Kyu Baek[Yu Na's brother] (Ep. 2, 4)Guest Role
- Im Sung MiYoon Yi Seul (Ep. 2, 9)Guest Role
- Park Ji HongSu Jan (Ep. 2-3, 10)Guest Role
- Nam Woo JooJung Hyun Soo (Ep. 2, 5-6, 10)Guest Role
- Park Seon HuRyu Dong Yeol [Young] (Ep. 3, 9)Guest Role
- Nam Do YoonRyu Soo Yeol / In Jae Hui [Young] (Ep. 3, 8-10, 12)Guest Role
- Jun Joon Woo[Attorney] (Ep. 4)Guest Role
- Kim Nam Jin[Dream Youth shelter director] (Ep. 4)Guest Role
- Kim Hyun Mok[Witness] (Ep. 4-5)Guest Role
- Lee Jong YoonLim [Detective] (Ep. 4-5, 12)Guest Role
- Kim Won Seok[Detective] (Ep. 5)Guest Role
- Yoon Dae Yeol[Beaten gang member] (Ep. 5)Guest Role
- Kyung Ki Hyun[Suspect] (Ep. 5)Guest Role
- Yum Jung Goo[Gyeong Jun's father] (Ep. 5)Guest Role
- Min Jung Sup[Detective] (Ep. 5)Guest Role
- Hong Seong Gwan[Friend of witness] (Ep. 5)Guest Role
- Choi Gyo Shik[Junkyard worker] (Ep. 5)Guest Role
- Joo Yeon Ah[Rehab center nurse] (Ep. 6)Guest Role
- Shin Joo HyupWoo Hyeok Jin (Ep. 6)Guest Role
- Kim Shin Rok[Prisoner] (Ep. 6)Guest Role
- Han Ji Ho[Commissioner's nephew] (Ep. 6-7)Guest Role
- Kim Joo Young[Gang member] (Ep. 6-7)Guest Role
- Shin Na Ra[Gang member] (Ep. 7)Guest Role
- Noh Jung Hwan[Eyes Candy cashier] (Ep. 7)Guest Role
- Lee Joo YoungPark Yi Hyun (Ep. 7-8)Guest Role
- Park Se In[Nurse] (Ep. 8)Guest Role
- Kim Bi Bi[Teacher] (Ep. 8)Guest Role
- Hong Je InKo Ga Young (Ep. 8)Guest Role
- Lee Jae Hak[Student bully] (Ep. 8)Guest Role
- Lee Ji Wan[Student bully] (Ep. 8)Guest Role
- Gu Da Song[Student bully] (Ep. 8)Guest Role
- Lee Jon Seung[Student bully] (Ep. 8)Guest Role
- Kim Yong HanShim Soo Hoon [Jung Hoon's brother] (Ep. 8-9)Guest Role
- Shin Moon Sung[Soo Yeol's father] (Ep. 8-9)Guest Role
- Park Seo YeonBaek Young Joo (Ep. 8-9, 11)Guest Role
- Kim Mi Hwa[Eun Seok's mother] (Ep. 8, 10, 12)Guest Role
- Park Min SangShim Jung Hoon (Ep. 8-9, 11-12)Guest Role
- Seo Jeong Hoo[Policeman] (Ep. 9)Guest Role
- Kim Ik TaeKeum Young Soo [Attorney] (Ep. 9)Guest Role
- Jang In Ho[Detective] (Ep. 9)Guest Role
- Oh Ki Hwan[Detective] (Ep. 9)Guest Role
- Bae Bo Ram[Social worker] (Ep. 9)Guest Role
- Yi SeoKi So Yeon (Ep. 9-10)Guest Role
- Yang Dae HyukPark Sung Gwan (Ep. 9-10)Guest Role
- Jang Nam BooSung Bok Joon (Ep. 9-11)Guest Role
- Jung Yoon SukJung Yoon Ho (Ep. 9-10, 12)Guest Role
- Jung Sun Chul[Drug dealer] (Ep. 10)Guest Role
- Kim Chil Doo[Motorcyclist] (Ep. 10)Guest Role
- Eom Ji Man[Police officer] (Ep. 10)Guest Role
- Jung Doo Won[Host bar owner] (Ep. 10)Guest Role
- Lee Dong Yong[Jung Hoon's uncle] (Ep. 10)Guest Role
- Kim Young JooShin Joo Hyuk [Painter] (Ep. 10-11)Guest Role
- Park No Kyeong Guest Role
- Kim Yong Jin[NFS medical examiner] (Ep. 11)Guest Role
- Kim Hwa JoongEun Young Ho (Ep. 4, 8)Guest Role
- Choi Bo Kwang[Jae Sun's wife] (Ep. 7)Guest Role
- Jung Sang HoonJung Gang Jae (Ep. 9)Guest Role
- Kim Jung HoonJeong Il SooGuest Role
- Han Sa Myung[Junkyard guy] (Ep. 6)Guest Role
- Park Joong Geun[Nurse] (Ep. 11-12)Guest Role
- Kim Seon HwaDr. Hong Suk Kyung [Psychiatrist] (Ep. 11-12)Guest Role
- Lee Ha Nee[Psychiatric patient] (Ep. 12)Guest Role
- Jo Kyun Hyung[Psychiatric patient] (Ep. 12)Guest Role
- Park Ki RyungKang Sung Dae (Ep. 12)Guest Role
- Ma Jung Pil[Attorney] (Ep. 12)Guest Role
- Park Se Hoon Guest Role
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