The Masked Leader welcomes VIP guests to the facility for a front-row viewing of the show. In the fifth game, some players crack under pressure.

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

Dong Geurami seeks legal advice from Youngwoo when her father unknowingly agrees to take on a massive debt. Kwon Minwoo broods in resentment.

Jae-ik and his crew run into a student from the school. Na-yeon works up the courage to face her peers. The group shares confessions around a fire.

In need of a cellphone, two students take a risky journey to the teachers’ office. Byeong-chan passes on critical information to Detective Song Jae-ik.

The infected multiply in droves. Scrambling for their lives, Nam On-jo and Lee Cheong-san find safety with others inside a classroom — but not for long.

When one of the group is scratched while fighting a zombie, Lee Na-yeon demands they kick him out. Outside, the virus swallows up the city.

Inside Lee Byeong-chan’s science lab, a student incurs a seemingly harmless bite. Shortly after, a fast-spreading outbreak soaks the school in blood.

Mutual grief over the pain suffered by a long-lost friend brings two women together. The story of the comfort women and the horrors they endured is told.