A group of people agree to take part in a mysterious competition in the hope of winning a large cash prize, but many bloody events soon occur and many lose their lives.
In the second season, Gi-hun returns with the leader, while the mysterious man appears with the Korean game Ddakji in a series of mysterious and bloody events.
In season 3, Seong Gi-hun returns for one last adventure in the Squid Game competitions that may shape his fate and future, as well as the future of the system and the game in general.