Guest Stars Kwon Yoo-joon as Masked Front Man Stand-in Jeon Young Soo voices Game Guide Kim Byung Chul as Instructions Guard Im Ki Hong as Jung Min-tae Park Hye Jin as Sang Woo's Mother Lee Seo Hwan as Park Jung Bae Jo Ah In as Sung Ga Young Kim Young Ok as Gi-hun's Mother Yoon Seung Hoon as Park Ju-un Choi Jae Seop as Park Man Cheol Park Si Wan as Kang Chul Yoon Don Sun as No Sang-hun Yang Mal Bok as Player 453 Kang Mal Geum as Ga-yeong's Mother Min Tae Yul as Player 271 Won Choon Gyu as Player 066 Hyun Jin as Player 209 Song Hyung Soo as Doctor So Yun Ho as Detective Seon In Ho as Police Detective Lee Jae Sung as Gangster Anwesha Purkayastha as Ali's Wife Go Chang Hee as Filipino Gangster Yang Hyung Taek as Drunk Go Chang Hee as Hassan Pyo Dong Joon as Ga-yeong's Brother Jang Jae Kwon as Ga-yeong's Stepfather Lee Choong Goo as Gang Member Kim Sung Gon as Detective Kim Kye Sun as Dormitory Owner Kim Min Shik as Kim Jin Woo Park Jung Eon as Player 073 Joon Hyun Sook as Fish Shop Customer Kim Seo Ha as Factory Owner Kim Young Sun as Gi-hun's Friend's Wife Lee Dong Yong as Kim Sang Hyuk
