| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Hwang Dong-hyuk | Crew | Production | Executive Producer, Writer, Director, Creator | 17 |
 Cho Sang-kyung | Crew | Costume & Make-Up | Costume Design | 9 |
 Lee Hyung-deok | Crew | Camera | Director of Photography | 9 |
Nam Na-young | Crew | Editing | Editor | 9 |
Han Heung-seok | Crew | Production | Producer | 9 |
 Chae Kyoung-sun | Crew | Art | Production Design, Production Designer | 9 |
Kim Ji-yeon | Crew | Production | Executive Producer | 9 |
Park Cheong-woo | Crew | Lighting | Lighting Director | 9 |
Jung Hoon | Crew | Camera | Key Grip | 9 |
 Park Young-sik | Crew | Crew | Martial Arts Choreographer | 9 |
Jeong Seong-ho | Crew | Crew | Martial Arts Choreographer | 9 |
Kim Hyung-seok | Crew | Editing | Digital Intermediate | 9 |
 Jung Jae-il | Crew | Sound | Original Music Composer | 9 |
Gang Hye-yeong | Crew | Sound | Sound Supervisor | 9 |
 Cho Tae-hee | Crew | Costume & Make-Up | Makeup & Hair | 9 |
Lim Sun-ae | Crew | Writing | Storyboard | 9 |
Park Kyoung-soo | Crew | Visual Effects | Special Effects Supervisor | 9 |
Park Jun-o | Crew | Sound | Foley Artist | 9 |
Jin Hoon | Crew | Art | Props | 9 |
Kim Jung-gon | Crew | Art | Set Dresser | 9 |
Park Hyun-soo | Crew | Sound | Production Sound Mixer | 9 |
Cheong Jai-hoon | Crew | Visual Effects | VFX Supervisor | 9 |
Park Sin-woong | Crew | Directing | Assistant Director | 9 |
Kim Ji-yeon | Crew | Production | Executive Producer | 8 |
 Lee Byung-hun | Cast | Actor | Front Man | 2 |
 Yang Dong-geun | Cast | Actor | 3 | |
 Geoffrey Giuliano | Cast | Actor | VIP 4 | 2 |
 Lee Jung-jae | Cast | Actor | Seong Gi-hun | 3 |
 Lee Jeong-heon | Cast | Actor | Banker | 1 |
 Heo Sung-tae | Cast | Actor | Jang Deok-su / 'No. 101' | 9 |
 Kim Yeong-ok | Cast | Actress | Gi-hoon's mother | 3 |
 Oh Young-soo | Cast | Actor | Oh Il-nam / 'No. 001' | 9 |
 Gong Yoo | Cast | Actor | The Salesman | 3 |
 Lee Jin-wook | Cast | Actor | 3 | |
Kim Joo-ryoung | Cast | Actress | Han Mi-nyeo / 'No. 212' | 9 |
 Kim Yun-tae | Cast | Actor | 'No. 069' | 3 |
 Lee Da-wit | Cast | Actor | 3 | |
 Lee Ji-ha | Cast | Actress | 'No. 070' | 2 |
 Choi Seung-hyun | Cast | Actor | 3 | |
 Jeong Woo-hyuk | Cast | Actor | 'No. 096' | 1 |
 Kim Young-sun | Cast | Actress | Gi Hoon's friend's wife | 1 |
 Kang Ha-neul | Cast | Actor | 3 | |
 Gwag Ja-hyeong | Cast | Actor | 'No. 278' | 4 |
 Jun Suk-ho | Cast | Actor | 3 | |
 Park Hae-soo | Cast | Actor | Cho Sang-woo / 'No. 218' | 9 |
 Lee You-mi | Cast | Actress | Ji-young / 'No. 240' | 9 |
Wi Ha-jun | Cast | Actor | Hwang Jun-ho | 9 |
 Park Gyu-young | Cast | Actress | 3 | |
 Yim Si-wan | Cast | Actor | 3 | |
 Kim Pub-lae | Cast | Actor | Loan shark | 1 |
 Son Young-soon | Cast | Actress | Flower seller | 1 |
 Park Sung-hoon | Cast | Actor | 3 | |
 Park Hye-jin | Cast | Actress | Sang-woo's mother | 3 |
 Lee Sang-hee | Cast | Actor | 'No. 017' | 2 |
 Lee Seo-hwan | Cast | Actor | Gi-hoon's friend | 2 |
 Heo Dong-won | Cast | Actor | 'No. 028' [Worker] | 3 |
 Yun Seung-hun | Cast | Actor | 'No. 369' | 3 |
 You Seong-joo | Cast | Actor | 'No. 111' | 3 |
 Yun Yeong-keol | Cast | Actor | Surgery Room Guard | 1 |
 Kang Mal-geum | Cast | Actress | Gi-hoon's ex-wife | 2 |
 Heo Sung-tae | Cast | Actor | Jang Deok-su / 'No. 101' | 9 |
 Kim Sung-gon | Cast | Actor | Detective | 1 |
 Lee Dong-yong | Cast | Actor | Kim Sang Hyuk (Police 1) | 1 |
 Jo Yu-ri | Cast | Actress | 3 | |
 Kim Dong-hyun | Cast | Actor | 'No. 196' | 3 |
 Kang Ae-sim | Cast | Actress | 3 | |
 Roh Jae-won | Cast | Actor | 3 | |
 Hwang Yeon-hui | Cast | Actress | 'No. 308' | 1 |
 Kim Min-sik | Cast | Actor | Kim Jin Woo (Police 2) | 1 |
 John D. Michaels | Cast | Actor | VIP 1 | 2 |
 Anupam Tripathi | Cast | Actor | Ali Abdul / 'No. 199' | 9 |
 Carla Fernanda Avila Escobedo | Cast | Actress | Girl in a leopard bodypaint | 1 |
 Park Ji-hoon | Cast | Actor | 'No. 250' | 1 |
 Jang Jae-kwon | Cast | Actor | Ga Yeong's stepfather | 1 |
 Park Si-wan | Cast | Actor | Sae-byeok's brother | 2 |
 Hoyeon | Cast | Actress | Kang Sae-byeok / 'No. 067' | 9 |
 Kim Gyeong-min | Cast | Actor | Racetrack man | 1 |
 Won Ji-an | Cast | Actress | 3 | |
 Daniel C. Kennedy | Cast | Actor | VIP 2 | 2 |
 Cho Ah-in | Cast | Actress | Seong Ga-yeong | 2 |
 Kim Gye-sun | Cast | Actress | Dorm owner | 1 |
 Anwesha Purkayastha | Cast | Ali's wife | 1 | |
 Yoon Ju-man | Cast | Actor | △ Mask / Surgery Room Guard 2 | 1 |
 Im Gi-hong | Cast | Actor | 'No. 322' | 3 |
 Yoon Don-sun | Cast | Actor | 'No. 119' | 2 |
 Hong Woo-jin | Cast | Actor | 'No. 118' | 1 |
 Park Seon-a | Cast | Actress | 'No. 107' | 1 |
 Yang Mal-bok | Cast | Actress | 'No. 453' | 2 |
 Kim Seo-hyeon | Cast | Actor | 'No. 244' | 4 |
 Woo Young-taek | Cast | Actor | 'No. 194' | 2 |
 Lee Jung-jun | Cast | Actor | □ Mask | 1 |
 Moon Byeong-ju | Cast | Actor | 'No. 021' | 3 |
 Lee Chung-gu | Cast | Actor | Gang member | 1 |
 Jeon Hyun-suk | Cast | Actress | Fish shop customer | 1 |
 Choi Jae-sup | Cast | Actor | North Korean defector shelter employee | 1 |
 Lee Doo-seok | Cast | Actor | 'No. 062' | 3 |
 Song Hyeong-su | Cast | Actor | Yoon [Emergency Medical Center doctor] | 1 |
 Min Tae-yul | Cast | Actor | 'No. 271' | 2 |
 Chris Chan | Cast | Actor | 'No. 276' | 1 |
 Kim Min-che | Cast | Actress | Hair Stylist | 1 |
| Person | Type | Job | Role(s) | Episodes |
