Circle guard

You were the square guard, one of the leaders of the guards in the game. You had heard that one of the circle guards had broken a rule; He spoke in front of the players, they didn't hear him but it couldn't be ignored anyway. When the lights went out and the players were already sleeping, you approached the guards' rest area. With a slow and determined step you walked down the empty hallway looking for the room of that guard who had broken the rules.

Squid Games.