- ??? - Jang Deok-su / 'No. 101'
- ??? - Han Mi-nyeo / 'No. 212'
- Anupam Tripathi - Ali Abdul / 'No. 199'
- Lee You-mi - Ji-young / 'No. 240'
- ?? - The Salesman
- Kim Pub-lae - Loan shark
- Kim Gyeong-min - Racetrack man
- Kim Yeong-ok - Gi-hoon's mother
- ??? - 'No. 111'
- Kim Gye-sun - Dorm owner
- Kim Min-sik - Kim Jin Woo (Police 2)
- Lee Dong-yong - Kim Sang Hyuk (Police 1)
- Lee Seo hwan - Gi-hoon's friend
- Kang Mal-geum - Gi-hoon's ex-wife
- Cho Ah-in - Seong Ga-yeong
- Yun Seung-hun - 'No. 369'
- Hong Woo-jin - 'No. 118'
- Woo Young-taek - 'No. 194'
- ??? - ? Mask / Surgery Room Guard 2
- Lee Ji-ha - 'No. 070'
- Kim Seo-hyeon - 'No. 244'
- Hwang Yeon-hui - 'No. 308'
- Kim Yun-tae - 'No. 069'
- Jeong Woo-hyuk - 'No. 096'
- Geoffrey Giuliano - VIP 4
- Daniel C. Kennedy - VIP 2
- John D. Michaels - VIP 1
- Heo Dong-won - 'No. 028' [Worker]
- Heo Dong-won - ? Mask
- Park Si-wan - Sae-byeok's brother
- Kim Dong-hyun - 'No. 196'
- Park Ji-hoon - 'No. 250'
- Park Seon-a - 'No. 107'
- Yoon Don-sun - 'No. 119'
- Lee Jung-jun - ? Mask
- Im Gi-hong - 'No. 322'
- Yun Yeong-keol - Surgery Room Guard
- Min Tae-yul - 'No. 271'
- Lee Doo-seok - 'No. 062'
- Song Hyeong-su - Yoon [Emergency Medical Center doctor]
- Kim Sung-gon - Detective
- So Yun-Ho - Detective
- ??? - Gang member
- Pyo Dong-jun - Ga Yeong's brother
- Jeon Hyun-suk - Fish shop customer
- Kim Young-sun - Gi Hoon's friend's wife
- Choi Jae-sup - North Korean defector shelter employee
- Carla Fernanda Avila Escobedo - Girl in a leopard bodypaint
- Han-sol Lee - No. 324
- Park Sin-woong
- ???
- Kim Ji-yeon
- ???
- Han Heung-seok
- Gang Hye-yeong
- ???
- Park Jun-o
- Park Hyun-soo
??? interpreta a Seong Gi-hun / 'No. 456' en la serie.
??? interpreta a Cho Sang-woo / 'No. 218' en la serie.
Wi Ha-jun interpreta a Hwang Jun-ho en la serie.
??? hace el papel de Kang Sae-byeok / 'No. 067'.
??? interpreta a Oh Il-nam / 'No. 001' en la serie.
??? interpreta a Jang Deok-su / 'No. 101' en la serie.
??? interpreta a Han Mi-nyeo / 'No. 212' en la serie.
Anupam Tripathi interpreta a Ali Abdul / 'No. 199' en la serie.
Lee You-mi interpreta a Ji-young / 'No. 240' en la serie.
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