12 episodes • January 28, 2022 - January 28, 2022

A high school becomes ground zero for a zombie virus outbreak. Trapped students must fight their way out or turn into one of the rabid infected.

12 episodes

1. 

   #1

   Episode 1

   66 min • Jan 28, 2022 (4 years ago)

   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.

2. 

   #2

   Episode 2

   70 min • Jan 28, 2022 (4 years ago)

   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.

3. 

   #3

   Episode 3

   62 min • Jan 28, 2022 (4 years ago)

   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.

4. 

   #4

   Episode 4

   72 min • Jan 28, 2022 (4 years ago)

   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.

5. 

   #5

   Episode 5

   56 min • Jan 28, 2022 (4 years ago)

   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.

6. 

   #6

   Episode 6

   67 min • Jan 28, 2022 (4 years ago)

   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.

7. 

   #7

   Episode 7

   60 min • Jan 28, 2022 (4 years ago)

   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.

8. 

   #8

   Episode 8

   58 min • Jan 28, 2022 (4 years ago)

   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.

9. 

   #9

   Episode 9

   61 min • Jan 28, 2022 (4 years ago)

   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.

10. 

    #10

    Episode 10

    54 min • Jan 28, 2022 (4 years ago)

    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.

11. 

    #11

    Episode 11

    56 min • Jan 28, 2022 (4 years ago)

    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.

12. 

    #12

    Episode 12

    53 min • Jan 28, 2022 (4 years ago)

    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.