Montaño investigates the bank account in Andorra. Zoe and Karina reach a breaking point. Esteban comes face to face with the fake Darío.

Montaño confronts Lys with the piling evidence against her. Suspicious of Darío, Alma sneaks into his hotel room and comes to a chilling realization.

Past and present come to a head as Alma decides to face the truth, however dark it may be, of what happened on that fateful night in the hotel.

Soo-ho’s heart breaks because of Yeong-ro. Meanwhile, the tension builds up as the hostage crisis makes it to the news nationwide.

Yeong-ro does not believe in Soo-ho’s sincerity and eventually works out an escape plan with Gang-mu.

When the anonymous reveals their identity, Han-na carries out Gang-mu’s order and moves to catch the secret evidence surrounding the hostage crisis.

Finally facing the cruel truth surrounding the hostage crisis, Soo-ho joins hands with his enemy Gang-mu and suppresses Cheong-ya.

With the situation getting worse, Soo-ho and Yeong-ro depend on each other more. Soo-ho and Kang-moo expose the scheme behind the presidential election.

Soo-ho comforts Yeong-ro who no longer trusts her father. Students are confused as to which side they should trust.

Soo-ho is heartbroken to see Yeong-ro struggling with guilt after hearing the news about her father. Soo-ho and Kang-moo start distrusting each other.

Giving up his hope in Cheong-ya, Soo-ho has no choice but to accept the head of the National Security Agency’s proposal.

Soo-ho, who left Yeong-ro, stands at the crossroads of fate just before returning to his hometown.

Turning a blind eye to Yeong-ro who feels betrayed, Soo-ho continues the hostage crisis, and a doctor, Kang Chung-ya, is sent in to treat an injured associate of Soo-ho.

When Soo-ho realises Yeong-ro is the daughter of the head of the National Security Agency, he has no choice but to use Yeong-ro to make it out alive.

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.

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.

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.

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.

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.

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.

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.

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 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.

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.

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.

After the accident, Young Min is still confused about whether he is dead or alive but realizes that his body is in a critical condition. With time running out, Young…

Nothing that has recently taken place was a coincidence, including both Chairman Jang’s critical condition and Young Min’s accident. Young Min’s job now is to find out who’s doing the…

With an emergency patient in front of him, Seung Tak struggles. At the same time, Young Min faces the risk of disappearing for good. The two become physically and mentally…

Seung Tak has no other option but to ask Young Min for help in saving an emergency patient. While Young Min is impressed with his good faith, he is also…

Young Min finds out from the ghost patient that the accident he was involved in was also planned out by someone. Meanwhile, Seung Jo begs Seung Tak to do whatever…