| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 You Sun-dong | Crew | Directing | Director | 12 |
 Kim Sae-bom | Crew | Writing | Writer, Creator | 12 |
 Sung Ji-ru | Cast | Actor | Kwak Bong-pil | 12 |
 Lee Dong-wook | Cast | Actor | Ryu Soo-yeol | 12 |
 Lee Joo-hyun | Cast | Actor | Lee Joo Hyun Tak Min Soo | 1 |
 Kim Bi-bi | Cast | Actress | [Teacher] | 1 |
 Kim Jae-man | Cast | Actor | Kim Dong Gyun [Police officer] | 1 |
 Cha Hak-yeon | Cast | Actor | Oh Kyung-tae | 12 |
 Shin Ju-hwan | Cast | Actor | Heo Jong-goo | 12 |
 Jung Yoon-suk | Cast | Actor | Jung Yoon Ho | 3 |
 Han Ji-eun | Cast | Actress | Lee Hee-gyeom | 12 |
 Wi Ha-jun | Cast | Actor | K | 12 |
 Han Gi-joong | Cast | Actor | Kim Sung-ho | 12 |
 Jang Jun-nyeong | Cast | Actor | Sung Bok Joon | 2 |
 Cho Dong-in | Cast | Actor | Jung Chan-ki | 12 |
 Lee Ha-nui | Cast | Actor | [Psychiatric patient] | 1 |
 Han Sa-myeong | Cast | Actor | [Junkyard guy] | 1 |
 Yoon Dae-yeul | Cast | Actor | [Beaten gang member] | 1 |
 Jeong Doo-won | Cast | Actor | [Host bar owner] | 1 |
 Won Hyun-jun | Cast | Actor | Andrei Kang | 12 |
 Kim Mi-hwa | Cast | Actress | [Eun Seok's mother] | 3 |
 Im Sung-jae | Cast | Actor | President Ma [Mobile funeral home boss] | 2 |
 Im Seong-mi | Cast | Actress | Yoon Yi Seul | 2 |
 Park Se-jun | Cast | Actor | Nam Eun-seok | 12 |
 Lee Hwa-ryong | Cast | Actor | Kim Kye-shik | 12 |
 Jeong Seon-cheol | Cast | Actor | [Drug dealer] | 1 |
 Kim Yong-jin | Cast | Actor | [NFS medical examiner] | 1 |
 Lee Dong-yong | Cast | Actor | [Jung Hoon's uncle] | 1 |
 Seol Chang-hee | Cast | Actor | [NFS technician] | 1 |
 Park Seo-yeon | Cast | Actress | Baek Young Joo | 3 |
 Kim Hyeon-mok | Cast | Actor | [Witness] | 2 |
 Lee Kyeong-uk | Cast | Actor | Shim Sang Ho | 3 |
 Cha Si-won | Cast | Actor | Yang Jae-seon | 12 |
 Jang In-ho | Cast | Actor | [Detective] | 1 |
 Kim Dae-gon | Cast | Actor | Ryu Dong-yeol | 12 |
 Yoo Jeong-ho | Cast | Actor | Ju Dae-won | 12 |
 Kim Ik-tae | Cast | Actor | Keum Young Soo [Attorney] | 1 |
 Park Ji-hong | Cast | Actor | Su Jan | 3 |
 Kim Kyu-baek | Cast | Actor | [Yu Na's brother] | 2 |
 Shin Mun-sung | Cast | Actor | [Soo Yeol's father] | 2 |
 Choi Kyo-sik | Cast | Actor | [Junkyard worker] | 1 |
 Lee Jong-yoon | Cast | Actor | Lim [Detective] | 3 |
 Kim Nam-jin | Cast | Actress | [Dream Youth shelter director] | 1 |
 Kang Ae-sim | Cast | Actress | Seo Seung-sook | 12 |
 Shin Joo-hyup | Cast | Actor | Woo Hyeok Jin | 1 |
 Kim Si-ha | Cast | Actress | Jung In Seon [Yoo Na's daughter] | 3 |
 Jo Kyung-hyun | Cast | Actor | [Psychiatric patient] | 1 |
 Yang Dae-hyeok | Cast | Actor | Park Sung Gwan | 2 |
 Kim Jung-hoon | Cast | Actor | Jeong Il-su | 12 |
 Jung Sung-il | Cast | Actor | Shin Joo-hyuk | 12 |
 Bae Bo-ram | Cast | Actress | [Social worker] | 1 |
 Yoo Seung-il | Cast | Actor | [General contractor] | 2 |
 Kim Shin-rock | Cast | Actress | [Prisoner] | 1 |
 Kim Sun-hoa | Cast | Actress | Dr. Hong Suk Kyung [Psychiatrist] | 2 |
 Park Yong | Cast | Actor | [Disciplinary hearing officer] | 1 |
 Lee Jae-eun | Cast | Actress | [Landlord] | 1 |
 Kim Young-Joo | Cast | Actor | Shin Joo Hyuk [Painter] | 2 |
 Park Ki-ryung | Cast | Actor | Kang Sung Dae | 1 |
 Choi Yi-sun | Cast | Actor | [Bathhouse cashier] | 1 |
 Park Jong-geun | Cast | [Nurse] | 2 | |
 Kim Won-suk | Cast | Actor | [Detective] | 1 |
 Nam Jeong-woo | Cast | Actor | [Police officer] | 1 |
 Gu Da-song | Cast | Actress | [Student bully] | 1 |
 Im Gi-hong | Cast | Actor | Do Yu-gon | 12 |
 Nam Woo-joo | Cast | Actor | Jung Hyun Soo | 4 |
 Lee Seung-heon | Cast | Actor | Kim Kyung-joon | 12 |
 Kim Joo-Young | Cast | Actor | [Gang member] | 2 |
 Kim Hieora | Cast | Actress | Boss Yong | 12 |
 Park Yu-mil | Cast | Actress | [Dong Yeol's girlfriend] | 1 |
 Nam Do-yoon | Cast | Actor | Ryu Soo Yeol / In Jae Hui [Young] | 5 |
 Yi Seo | Cast | Actress | Ki So Yeon | 2 |
 Jeon Jun-woo | Cast | Actor | [Attorney] | 1 |
 Min Jung-sup | Cast | Actor | [Detective] | 1 |
 Kim Chil Doo | Cast | Actor | [Motorcyclist] | 1 |
 Lee Ji Wan | Cast | Actress | [Student bully] | 1 |
 Yum Jung-Goo | Cast | Actor | [Gyeong Jun's father] | 1 |
 Joo Yeon-a | Cast | Actress | [Rehab center nurse] | 1 |
 Han Ji-ho | Cast | Actor | [Commissioner's nephew] | 2 |
| Person | Type | Job | Role(s) | Episodes |
