Numbers in parentheses denote the character’s assigned number in the Squid Game.
Lee Jung-jae as Seong Gi-hun (성기훈,Korean pronunciation: [sʌŋ gi hun],456), a chauffeur and a gambling addict, he lives with his mother and struggles to financially support his daughter. He participates in the Game to settle his many debts.
Park Hae-soo as Cho Sang-woo (조상우 , Korean pronunciation: [tɕo saŋ u],218), the head of the investment team at a securities company, he is a junior to Gi-hun and was a gifted student who studied at Seoul National University, but is now wanted by the police for stealing money from his clients.
Jung Ho-yeon as Kang Sae-byeok (강새벽, Korean pronunciation: [gaŋ sɛ bjʌk],067), a North Korean defector who enters the Game to pay for a broker to find and retrieve her surviving family members who are still across the border.
O Yeong-su as Oh Il-nam (오일남,Korean pronunciation: [O il nam],001), an elderly man with a brain tumor who prefers playing the Game as opposed to waiting to die in the outside world.
Heo Sung-tae as Jang Deok-su (장덕수,Korean pronunciation: [dzaŋ dʌk su],101), a gangster who enters the Game to settle his massive gambling debts.
Anupam Tripathi as Abdul Ali (199), a foreign worker from Pakistan who enters the Game to provide for his young family after his employer refuses to pay him for months.
Kim Joo-ryoung as Han Mi-nyeo (212), a mysterious and manipulative woman who claims to be a poor single mother.
Wi Ha-joon as Hwang Jun-ho, a police officer who sneaks into the Game as a guard to find his missing brother.
Yoo Sung-joo as Byeong-gi (111), a doctor who secretly works with a group of corrupt guards to traffic the organs of dead participants in exchange for information on upcoming games.
Lee Yoo-mi as Ji-yeong (240), a young woman who was just released from prison after killing her abusive father.
Kim Si-hyun as Player 244, a pastor who rediscovers his faith during the Game.
Lee Sang-hee as Player 017, a glass-maker with more than 30 years experience.
Kim Yun-tae as Player 069, a player who joins the Game with his wife, Player 070.
Lee Ji-ha as Player 070, a player who joins the Game with her husband, Player 069.
Kwak Ja-hyoung as Player 278, a player who joins Deok-su’s group and acts as his henchman.
Chris Chan as Player 276, a player who joins Seong Gi-hun’s group in the Tug of War round.
Kim Young-ok as Gi-hun’s mother
Cho Ah-in as Seong Ga-yeong, Gi-hun’s daughter
Kang Mal-geum as Gi-hun’s ex-wife and Ga-yeong’s mother
Park Hye-jin as Sang-woo’s mother
Park Si-wan as Kang Cheol / Sae-byeok’s brother
Gong Yoo as a salesman who recruits participants for the Game (Episodes 1 and 9)
Lee Byung-hun as The Front Man / Hwang In-ho (Episodes 8–9)
Lee Jung-jun as Guard (Episode 3)