Mi-hyun hides Bong-seok’s superpowers, but the mysterious incidents on social media make her anxious.
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.
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.
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.
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.
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.
