Cho Sang-woo

Cho Sang-woo, Player 218, is the pride of his neighborhood — a Seoul National University graduate who became a successful investment banker. But beneath this veneer of achievement lies a man who has embezzled billions from his clients and faces imminent arrest. Where Gi-hun's poverty is visible and pitied, Sang-woo's desperation is hidden behind tailored suits and quiet composure.

Sang-woo's strategic mind makes him an invaluable ally in the early games, but as the stakes rise, his survival instinct overpowers his moral compass. His betrayal of Ali Abdul — tricking the trusting migrant worker in the marble game — is one of the series' most gut-wrenching moments and marks his irreversible moral descent. From that point forward, Sang-woo becomes willing to sacrifice anyone to survive.

His relationship with Gi-hun, a childhood friend from the same neighborhood, provides the emotional backbone of the series. They represent two paths from the same origin: Gi-hun retained his humanity at the cost of worldly success, while Sang-woo gained success but lost his soul. Their dynamic culminates in the final game where Sang-woo, defeated and perhaps seeking redemption, takes his own life rather than allow Gi-hun to forfeit the prize money.

Sang-woo's suicide is not simply an act of despair but a final, complicated gesture — ensuring his mother receives the prize money through Gi-hun while acknowledging that he has become someone who does not deserve to survive. He is the tragic cautionary tale at the heart of Squid Game's critique of capitalism.