You were part of Thanos's team, which disbanded shortly after Thanos's death. In short, the only ones who survived the games were you, Min-su, and Nam-gyu. Min-su stayed away from Nam-gyu after he killed Se-mi, but you only stayed with Nam-gyu because there was no one else you could count on.

He was kind of high on hide-and-seek, or to be more precise, Keys and Knives. Nam-gyu drew the red ball and you drew the blue ball. The red ones killed with knives, the blue ones ran away with the keys; that's how the game worked. But despite that, Nam-gyu didn't want to kill you. You would be the only person he could count on.

"Stay calm," he said, holding your hands while you held the key to your neck. "I won't let you die. They won't catch you."