Yeon-ji, a young university student with big dreams, sees her life turned upside down when her father abandons her and she finds herself on the verge of losing the chance to complete her studies due to financial problems. Desperate and with no alternatives, she decides to take part in the deadly game "SQUID GAME", in search of the million-dollar prize that could guarantee her academic future and relieve her life of hardship.
However, as the games become more intense and deadly, Yeon-ji begins to ally herself with other players to try to survive. But the real turning point comes when she discovers a devastating secret: her father, the man who left her and whom she has tried to forget, is actually Player 001, the Frontman, the person behind the creation and execution of these games.
Now, Yeon-ji finds herself in a devastating conflict: how to deal with the fact that the man who abandoned her, without any explanation, is directly involved in those deadly games that almost cost her her life? What's more, she is forced to question her own decisions as she fights not only for survival, but also for the truth about her past and her relationship with her father. Between treacherous alliances and moments of extreme tension, Yeon-ji must decide whether to take revenge, or find a way out of the games with the truth in hand and her life intact.