Hoping to win easy money, a desperate Gi-hun agrees to take part in an enigmatic game; not long into the first round, unforeseen horrors unfold.

Split on whether to continue or quit, the group holds a vote; their realities in the outside world may prove to be just as unforgiving as the game.

A few players enter the next round, which promises equal doses of sweet and deadly; Jun-ho sneaks his way inside.

As alliances form among the players, no one is safe in the dormitory after lights out; the third game challenges Gi-hun's team to think strategically.

Gi-hun and his team take turns keeping guard through the night; the masked men encounter trouble with their co-conspirators.

Players pair off for the fourth game; Gi-hun grapples with a moral dilemma; Sang-woo chooses self-preservation; Sae-byeok shares her untold story.