Episode list

A year ago, an unidentified ball fell over the world. In order to receive additional points for the SAT, where the national mobilization order was issued, high school students write a consent form, and afterschool war activities begin.

Leaving behind the heavy sphere that fell to the school, Sungjin High School students begin military training. Children getting used to the training, finally going out of school for the first time since the first training day of the first live ammunition shooting... But didn't they have to come out of school?

The surviving children from Class 3-2 return to Sugjin High School. The children who learn the reality of the sphere are conflicted about whether to stay at school or leave for the shelter where their parents are. Soldiers stop the children, who eventually decide to leave. At that time.

The first vehicle gets attacked by a sphere and turned over. The soldier dies on the spot, and So-yeon gets badly injured. The students decide to leave the vehicle and find a shelter nearby. Soon, they find a construction site office where they can hide and rest. However, their peace doesn't last long. Meanwhile, Lieutenant Lee goes against the order and steals a vehicle to rescue the students.

Chun-ho tries to make sure that the kids all survive so they can return safely to the camp. The kids after having gone through a common struggle begin to bond with each other. They also begin to learn more things about being a soldier. But there seems to be a more ominous order awaiting them from high command. Will they make it through another day?

After a heated encounter with the spheres, the group picked up some survivors. However, the heavily traumatized survivors have a hard time blending in and coping with the situation. Their outbursts and dire situation make the group rethink their morals and imperatives. Will they carry on with the mission or will they flee for their own safety?

The students of Class Two continue to fight and kill the spheres. They have a vote again to decide whether they will stay here together or go back home, and the result shows that there's disagreement growing among them. The next day, a group of students go somewhere to find parts to fix their radio. There, they run into strangers who ask for help.

Platoon Two encounter prisoners at the Yongwon Penitentiary. Since there are no prison guards, they have been locked up without any food supplies for a while now, and they threaten the kids to open the cell doors. One of the prisoners hands over a photo of his mother and begs Ae-seol to contact her for him. Meanwhile, at Yongdu Service Area, intruders barge in and look around the place.

While trying to save Bo-ra, Soo-chul sacrifices himself. Everyone wonders what they should do with his body when suddenly someone mentions that Soo-chul rigged voting. After finding out the truth behind the voting, they break into a fight. Then they find out why Soo-chul had to manipulate votes, which comes as a shock.

After aborting the mission, the kids walk for days but get to nowhere. However, they reach an amusement park and have fun as if it is their last. Meanwhile, Yeong-soo is not comfortable about walking away from the mission as he still believes the CSAT is not canceled. The end of the war draws near, but the kids have a long way left to survival.