Lee Jung-jae
Seong Gi-hun / 'No. 456' (9 eps)
Wi Ha-jun
Hwang Jun-ho (9 eps)
Park Hae-soo
Cho Sang-woo / 'No. 218' (9 eps)
Jung Ho-yeon
Kang Sae-byeok / 'No. 067' (9 eps)
Oh Young-soo
Oh Il-nam / 'No. 001' (9 eps)
Heo Sung-tae
Jang Deok-su / 'No. 101' (9 eps)
Kim Joo-ryoung
Han Mi-nyeo / 'No. 212' (9 eps)
Anupam Tripathi
Ali Abdul / 'No. 199' (9 eps)
Lee You-mi
Ji-young / 'No. 240' (9 eps)
Gwag Ja-hyeong
'No. 278' (4 eps)
Kim Seo-hyeon
'No. 244' (4 eps)
Heo Dong-won
'No. 028' [Worker] (4 eps)
Kim Yeong-ok
Gi-hoon's mother (3 eps)
You Seong-joo
'No. 111' (3 eps)
Yun Seung-hun
'No. 369' (3 eps)
Kim Yun-tae
'No. 069' (3 eps)
Kim Dong-hyun
'No. 196' (3 eps)
Moon Byeong-ju
'No. 021' (3 eps)
Im Gi-hong
'No. 322' (3 eps)
Lee Doo-seok
'No. 062' (3 eps)
Lee Byung-hun
Front Man (2 eps)
Lee Seo-hwan
Gi-hoon's friend (2 eps)
Kang Mal-geum
Gi-hoon's ex-wife (2 eps)
Cho Ah-in
Seong Ga-yeong (2 eps)
Woo Young-taek
'No. 194' (2 eps)
Lee Ji-ha
'No. 070' (2 eps)
Lee Sang-hee
'No. 017' (2 eps)
Yang Mal-bok
'No. 453' (2 eps)
Geoffrey Giuliano
VIP 4 (2 eps)
Daniel C Kennedy
VIP 2 (2 eps)
John D. Michaels
VIP 1 (2 eps)
Park Si-wan
Sae-byeok's brother (2 eps)
Yoon Don-sun
'No. 119' (2 eps)
Min Tae-yul
'No. 271' (2 eps)
Kim Pub-lae
Loan shark (1 eps)
Kim Gyeong-min
Racetrack man (1 eps)
Kim Gye-sun
Dorm owner (1 eps)
Kim Min-sik
Kim Jin Woo (Police 2) (1 eps)
Lee Dong-yong
Kim Sang Hyuk (Police 1) (1 eps)
Anwesha Purkayastha
Ali's wife (1 eps)
Hong Woo-jin
'No. 118' (1 eps)
Yoon Ju-man
△ Mask / Surgery Room Guard 2 (1 eps)
Hwang Yeon-hui
'No. 308' (1 eps)
Jeong Woo-hyuk
'No. 096' (1 eps)
Son Young-soon
Flower seller (1 eps)
Lee Jeong-heon
Banker (1 eps)
Park Ji-hoon
'No. 250' (1 eps)
Park Seon-a
'No. 107' (1 eps)
Lee Jung-jun
□ Mask (1 eps)
Yun Yeong-keol
Surgery Room Guard (1 eps)
Wie Ji-Yeon
Ha Sun Young [Teller] (1 eps)
Park Si-won
Cho Sang Woo [Young] (1 eps)
Kim Yeon-woong
Seong Gi Hoon [Child] (1 eps)
Song Hyeong-su
Yoon [Emergency Medical Center doctor] (1 eps)
Kim Sung-gon
Detective (1 eps)
So Yun Ho
Detective (1 eps)
Lee Chung-gu
Gang member (1 eps)
Kim Seo-ha
Factory owner (1 eps)
Pyo Dong-jun
Ga Yeong's brother (1 eps)
Jeon Hyun-suk
Fish shop customer (1 eps)
Jang Jae-kwon
Ga Yeong's stepfather (1 eps)
Kim Young-sun
Gi Hoon's friend's wife (1 eps)
Choi Jae-sup
North Korean defector shelter employee (1 eps)
Chris Chan
'No. 276' (1 eps)
Kim Min-che
Hair Stylist (1 eps)
Carla Fernanda Avila Escobedo
Girl in a leopard bodypaint (1 eps)
Han-sol Lee
No. 324 (1 eps)
