- Lee Seung-heon - Kim Kyung-joon
- ??? - Kwak Bong-pil
- Lee Jin-hong - Yang Jae-seon
- Lee Hwa-ryong - Kim Kye-shik
- Shin Ju-hwan - Heo Jong-goo
- Cho Dong-in - Jung Chan-ki
- Won Hyun-jun - Andrei Kang
- Im Gi-hong - Do Yu-gon
- Park Se-jun - Nam Eun-seok
- Choi Kwang-je - Yum Geun-soo
- Han Gi-joong - Kim Sung-ho
- Yoo Jeong-ho - Ju Dae-won
- ??? - Shin Joo-hyuk
- Kim Jung-hoon - Jeong Il-su
- Han Sang-chul - [Fight spectator]
- Choi Yi-sun - [Bathhouse cashier]
- Kim Jae-man - Kim Dong Gyun [Police officer]
- Nam Jeong-woo - [Police officer]
- Lee Jung-yeol - [Apartment security guard]
- Park Yong - [Disciplinary hearing officer]
- Park Sang-hyeok - [Disciplinary hearing officer]
- Yoo Seung-il - [General contractor]
- Yoon Tae-in - [Detective]
- Lee Seo-An - Jung Yoo Na
- Kim Si-ha - Jung In Seon [Yoo Na's daughter]
- ??? - Tak Min Soo
- ??? - Lee Joo Hyun Tak Min Soo
- Lee Kyeong-uk - Shim Sang Ho
- Seol Chang-hee - [NFS technician]
- Park Yu-mil - [Dong Yeol's girlfriend]
- Im Sung-jae - President Ma [Mobile funeral home boss]
- Kim Kyu-baek - [Yu Na's brother]
- Im Seong-mi - Yoon Yi Seul
- Park Ji-hong - Su Jan
- Park Seon-Hu - Ryu Dong Yeol [Young]
- Nam Do-yoon - Ryu Soo Yeol / In Jae Hui [Young]
- Jeon Jun-woo - [Attorney]
- Kim Nam-jin - [Dream Youth shelter director]
- Kim Hyeon-mok - [Witness]
- Lee Jong-yoon - Lim [Detective]
- Kim Won-suk - [Detective]
- Yoon Dae-yeul - [Beaten gang member]
- Min Jung-sup - [Detective]
- Choi Kyo-sik - [Junkyard worker]
- Shin Joo-hyup - Woo Hyeok Jin
- ??? - [Prisoner]
- Han Sa-myeong - [Junkyard guy]
- Han Ji-ho - [Commissioner's nephew]
- Shin Na-ra - [Gang member]
- Park Se-in - [Nurse]
- Kim Bi-bi - [Teacher]
- Shin Mun-sung - [Soo Yeol's father]
- Park Seo-yeon - Baek Young Joo
- ??? - [Eun Seok's mother]
- Park Min-sang - Shim Jung Hoon
- Seo Jung-hoo - [Policeman]
- Kim Ik-tae - Keum Young Soo [Attorney]
- Jang In-ho - [Detective]
- Bae Bo-ram - [Social worker]
- Yi Seo - Ki So Yeon
- Yang Dae-hyeok - Park Sung Gwan
- Jang Jun-nyeong - Sung Bok Joon
- Jung Yoon-suk - Jung Yoon Ho
- Jeong Seon-cheol - [Drug dealer]
- Kim Chil Doo - [Motorcyclist]
- Eom Ji-man - [Police officer]
- Jeong Doo-won - [Host bar owner]
- Lee Dong-yong - [Jung Hoon's uncle]
- Kim Yong-jin - [NFS medical examiner]
- Park Jong-geun - [Nurse]
- Kim Sun-hoa - Dr. Hong Suk Kyung [Psychiatrist]
- Lee Ha-nui - [Psychiatric patient]
- Jo Kyung-hyun - [Psychiatric patient]
- Park Ki-ryung - Kang Sung Dae
- Ma Jeong-pil - [Attorney]
- You Sun-dong
- Kim Sae-bom
??? interpreta a Ryu Soo-yeol en la serie.
Wi Ha-jun hace el papel de K.
Han Ji-eun interpreta a Lee Hee-gyeom en la serie.
??? hace el papel de Oh Kyung-tae.
??? hace el papel de Seo Seung-sook.
Kim Dae-gon hace el papel de Ryu Dong-yeol.
Cha Si-won interpreta a Yang Jae-seon en la serie.
Lee Sang-hong interpreta a Do In-bum en la serie.
Kim Hieora interpreta a Boss Yong en la serie.
Lee Seung-heon interpreta a Kim Kyung-joon en la serie.
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