Seong Gi-Hun, Player 456, returns to the new Squid Game as a former champion turned determined infiltrator. After winning the 45.6 billion won prize in 2021, Gi-Hun abandoned his red hair and comfortable life to investigate the organization, ultimately choosing to re-enter the games to expose their brutality and save innocent lives. His experience as the previous winner makes him both a target and a symbol of hope for other contestants.