Director
Screenwriter
Main Role
- Park Hae Soo Main Role
- Claudia Kim Main Role
- Lee Hee Joon Main Role
- Cha Joo Young Main Role
Support Role
- Nam Gi AeCha Eun Su [Jae Hwan's mother]Support Role
- Heo Jun SeokKo Gwang Su [Head, Special Investigation Team]Support Role
- Woo HyunBae Seung Gwan [Police Chief, Seoul Jungsan Police Station]Support Role
- Kwon Hyuk HyunLee Gun Yeong [Special Investigation Team]Support Role
- Yoon Ji WonJang Ha Na [Special Investigation Team]Support Role
- Kim Ji HoonCho Han Cheol [Violent Crimes Team]Support Role
- Jung Young KiIm Pil Seong [Violent Crimes Team]Support Role
- Lee Gi YoungSeo Hyeon Tae [Chairman, Seoryun Group]Support Role
- Kim Ho JungLee Hwa Jeong [Chairman, Seoryun Hospital]Support Role
- Kim Kwi SeonLee Min Gi [Hwa Jeong's brother]Support Role
Guest Role
- Yeom Dong HunSon Wan Gi (Ep. 1)Guest Role
- Lee Seung Hee[Wan Gi's mistress] (Ep. 1)Guest Role
- Yoon Jong Goo[Gambling house man] (Ep. 1)Guest Role
- Yoo Sang Hoon[Gambling house security] (Ep. 1)Guest Role
- Uhm Hye Soo[Nurse] (Ep. 1)Guest Role
- Oh Jin Ha[Nurse] (Ep. 1)Guest Role
- Kang Chul Sung[Doctor] (Ep. 1)Guest Role
- Park Seung Chan[KCSI investigator} (Ep. 1)Guest Role
- Im Chul SooHong Yeong Sik [Criminal] (Ep. 1-2)Guest Role
- Ryu Tae HoDoctor Yang [Medical examiner] (Ep. 1-3)Guest Role
- Kang Shin IlHan Ju Seok (Ep. 1-3)Guest Role
- Seo Young HwaMadam Hwang [Gambling house shaman] (Ep. 1, 5, 10)Guest Role
- Lee Gyu Bok Guest Role
- Shin Min JaeKang Ho Dong [Criminal] (Ep. 1-2, 13-14)Guest Role
- Heo Hyung Kyu[KCSI investigator] (Ep. 1, 3, 8, 10, 15)Guest Role
- Kang Jung GooO Jong Geun (Ep. 2)Guest Role
- Kim Do HyeongSon Wan Gi [Young] (Ep. 2)Guest Role
- Kim Sa Hun[Reporter] (Ep. 2)Guest Role
- Im Ji Hyun[Hospital records staff] (Ep. 2)Guest Role
- Kwon Hyuk BumHam Yong Bok [Young] (Ep. 2, 5, 13, 15)Guest Role
- Yang Joo HoBae Seung Gwan [Young] (Ep. 2, 4-6, 13, 15)Guest Role
- Kang Sang WonLee Sang U (Ep. 2, 6, 8, 13, 15)Guest Role
- Kim Hyo MyungHan Ju Seok [Young] (Ep. 2, 5, 8, 13, 15-16)Guest Role
- Yoon HyunIm Sang Uk [Young] (Ep. 3)Guest Role
- Park YongLee Seon Ho (Ep. 3)Guest Role
- Heo Seon HaengJang Su Jin (Ep. 3)Guest Role
- Bae Gi Beom[Police officer] (Ep. 3)Guest Role
- Min Dae Shik[Seoryun Group executive] (Ep. 4)Guest Role
- Kim Sang Il[Legal department executive] (Ep. 4)Guest Role
- Kim Do ShinChoi Jong Ho (Ep. 4)Guest Role
- Shim Young MinPark Seong Hwa (Ep. 4)Guest Role
- Yoon Hee Won[Hospital attorney] (Ep. 4)Guest Role
- Lee Jae EunMs. Jang (Ep. 4)Guest Role
- Ok Joo Ri[Ju Seok's landlord] (Ep. 4)Guest Role
- Jang Joon HoHan Jong U (Ep. 4, 8)Guest Role
- Lee Joo WonLee Tae Yeong [Young] (Ep. 4-5, 8)Guest Role
- Song Kyung EuiPark In Sang (Ep. 4, 9-10)Guest Role
- Kim Jeong HakYeong Jun [UBS network manager] (Ep. 4, 7-8, 11)Guest Role
- Seok Bo BaeJeon Yeong Sin (Ep. 5)Guest Role
- Sung Hyun Mi[Convenience store owner] (Ep. 5)Guest Role
- Shin Mi Young[Adoption records employee] (Ep. 5)Guest Role
- Park Jong Bo[Landlord] (Ep. 5)Guest Role
- Lee Chae MinJung Sun Jeong (Ep. 5-7)Guest Role
- Lee Seung HunHam Yong Bok (Ep. 5-7)Guest Role
- Kim Gyeong MinMr. Moon (Ep. 5, 10-11, 15)Guest Role
- Kim Dae KookChoi Sang Un (Ep. 6)Guest Role
- Yoo Se Rye[Nurse] (Ep. 6)Guest Role
- Park Young Bok[Child support client] (Ep. 6)Guest Role
- Kong Hyun Ji[Nurse] (Ep. 6)Guest Role
- Barri TsavarisSam [Eugene's friend] (Ep. 6, 11)Guest Role
- Lee Si HoonSeo Hyeon Tae [Young] (Ep. 6-7, 10, 15)Guest Role
- Han Ji WanRyu Seong Hui (Ep. 6, 9-10, 13, 16)Guest Role
- Choi Hong IlKim Hyeong Guk [Attorney] (Ep. 6-7, 10-12, 15-16)Guest Role
- Ju Min Chan[Paramedic] (Ep. 7)Guest Role
- Lee Dong Wook[Paramedic] (Ep. 7)Guest Role
- Kim Hyo Jin[Sang Gu's mother] (Ep. 7)Guest Role
- Lee Se Rang[Orphanage staff] (Ep. 7)Guest Role
- Yoon Hyo Sik[Macheon community center staff] (Ep. 7)Guest Role
- Ryoo Sung Ryul[TV reporter] (Ep. 7)Guest Role
- Park Byung Wook[Site manager] (Ep. 7-8)Guest Role
- Jo Nam Hee[Doctor] (Ep. 7, 10)Guest Role
- Jo Seung Yun[Hanmyung University professor] (Ep. 8)Guest Role
- Ahn Sung GunPyo Ji Seong (Ep. 9)Guest Role
- Kwon Tae Jin[Materials management staff] (Ep. 9)Guest Role
- Park Min Young[Hanmyung University employee] (Ep. 9)Guest Role
- Kwon Ban Suk[Detective] (Ep. 9)Guest Role
- Kim Dong Gyu[Detective] (Ep. 9)Guest Role
- Jang Tae MinLee Min Gi [Young / Prosecutor] (Ep. 11)Guest Role
- Lee Hae WoonKim Hyeong Guk [Young / Attorney] (Ep. 11)Guest Role
- Son Dong HwaNa Hyeong Jun (Ep. 12)Guest Role
- Park Jung Min[EOD member] (Ep. 12)Guest Role
- Kim Seung Jun[Police officer] (Ep. 13)Guest Role
- Kim Byung Chul[Prosecutor] (Ep. 12-14)Guest Role
- Lee Jin Kwon[Prosecutor] (Ep. 12-14)Guest Role
- Kim Dong Gon[Security guard] (Ep. 14)Guest Role
- Song Yoo Hyun[Hyo Gyeong's colleague] (Ep. 14-16)Guest Role
- Yeon Je Hun[Police officer] (Ep. 15)Guest Role
- Lee Dong Gyu[Reporter] (Ep. 16)Guest Role
- Oh Ki Hwan[Hanter Production CEO] (Ep. 16)Guest Role
- Kim Joo IlYun SeokGuest Role
- Kim Seung Hyun[Illegal gambling guest]Guest Role
- Song Chi Hoon[Cameraman]Guest Role
Unknown
- Jung Min Seok Unknown
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