Season 1

E1. Episode 1

Jan 28, 2022 · 66m

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.

E2. Episode 2

Jan 28, 2022 · 70m

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.

E3. Episode 3

Jan 28, 2022 · 62m

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.

E4. Episode 4

Jan 28, 2022 · 72m

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.

E5. Episode 5

Jan 28, 2022 · 56m

Martial law is imposed on the city. When Cheong-san is separated from the rest of the group, On-jo leads a mission to use a drone to locate him.

E6. Episode 6

Jan 28, 2022 · 67m

The group clears a path to Cheong-san using sound to draw away zombies, but a new type of threat surfaces. Nam So-ju breaks out of the quarantine camp.

E7. Episode 7

Jan 28, 2022 · 60m

To make it out of the music room and onto the roof, the students put into action their most perilous plan yet. Elsewhere, Jae-ik comes across a setback.

E8. Episode 8

Jan 28, 2022 · 58m

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.

E9. Episode 9

Jan 28, 2022 · 61m

A disturbance at the camp shifts the military's understanding of the virus. A thunderstorm provides cover as the group agrees to keep on moving.

E10. Episode 10

Jan 28, 2022 · 54m

The auditorium quickly becomes a trap for the two newly united teams of survivors. Byeong-chan's video logs reveal a drastic solution to the crisis.

E11. Episode 11

Jan 28, 2022 · 56m

Though a surprise protector provides the group safe passage to their next stop, Yoon Gwi-nam is not far behind. The military makes a grave decision.

E12. Episode 12

Jan 28, 2022 · 53m

The students make it to the quarantine camp, each of them weighed down by tragic loss. Months later, they hang on to hope for a survivor.