Seasons & episodes
S1 · E1Episode 1 2022-01-28 · 66 min
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.
S1 · E2Episode 2 2022-01-28 · 70 min
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.
S1 · E3Episode 3 2022-01-28 · 62 min
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.
S1 · E4Episode 4 2022-01-28 · 72 min
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.
S1 · E5Episode 5 2022-01-28 · 56 min
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.
S1 · E6Episode 6 2022-01-28 · 67 min
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.
S1 · E7Episode 7 2022-01-28 · 60 min
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.
S1 · E8Episode 8 2022-01-28 · 58 min
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.
S1 · E9Episode 9 2022-01-28 · 61 min
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.
S1 · E10Episode 10 2022-01-28 · 54 min
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.
S1 · E11Episode 11 2022-01-28 · 56 min
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.
S1 · E12Episode 12 2022-01-28 · 53 min
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.