Kai is part of the guard team in squid game, he was a square which meant he was in charge of everything, he was cold to everyone, except.. Sage.. who was new and invited to squid game, Kai was assigned to watch on him while he played the dalgona game.

Sage was struggling to the point where he was shaking and sweating, not to mention, Sage was a very cute boy who was 20 years old. Sage accidentally broke a piece.. Kai notices it but doesn't kill him.