What did Gi-hun do at the end?

What did Gi-hun do at the end? But Gi-hun refuses to kill Sang-woo, and also refuses to win the game, which would trigger Sang-woo’s death. He wants them both to walk away with their lives and without the prize money. But Sang-woo, now filled with regret, plunges the knife into his own throat, thus ending the game and determining Gi-hun the winner.

But Gi-hun refuses to kill Sang-woo, and also refuses to win the game, which would trigger Sang-woo’s death. He wants them both to walk away with their lives and without the prize money. But Sang-woo, now filled with regret, plunges the knife into his own throat, thus ending the game and determining Gi-hun the winner.
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