About
When mysterious alien spheres start invading the world, high school students are called upon to join the world's first war against extraterrestrial forces.
Cast
Kim Ki-hae
as Kim Chi-yeol
Shin Myung-sung
as Im Woo-taek
Shin Hyun-soo
as Lee Chun-ho
Lim Se-mi
as Park Eun-young
Ahn Do-gyu
as Guk Young-su
Kim Min-chul
as Doh Su-chul
Kim Su-gyeom
as Kwon Il-ha
Ro Jong-hyun
as Jang Young-hoon
Woo Min-kyu
as Kim Duk-joong
Yeo Joo-ha
as Kim You-jung
Ahn Da-eun
as Kim In-hye
Lee Yeon
as Roh Ae-sul
Kwon Eun-bin
as Yeon Bo-ra
Moon Sang-min
as Wang Tae-man
Choi Moon-hee
as Lee Na-ra
Kim So-hee
as Lee Soon Yi
Ji Min-hyuk
as Jo Young-shin
Oh Gi-gwang
as Jo Jang-su
Shin Su-hyun
as Cha So-yeon
Hong Xa-bin
as Woo Hee-rak
Seasons
Episodes
Season 1
Question the Spheres
For a year, people learn to live with the spheres without suffering any specific changes. Even with the alien-looking spheres floating all over the sky, the CSAT is what matters the most to seniors of Sungjin High School. When the exam is just around the corner, one of the spheres drops on a military camp for the first time, and more shocking news awaits them.
Military Training Begins
After spheres from the sky drop to the ground, military training begins for the students to ensure their safety. However, the students find it too demanding and have a difficult time. As students head to the shooting range to learn how to shoot, they get caught off guard and fall into a crisis. Meanwhile, a student gets killed by one of the spheres.
School Escape
Two people from Class Two die. To prevent chaos, this news is not yet known throughout the entire school. After their deaths, students of Class Two get sick of all the hardcore training and try to escape school to go back to their homes. However, all their attempts go to waste and the biggest attack of the spheres begins.
Become the Villain
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.
Will We Ever Go Home?
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?
Fight or Flight
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?
Disagreement Among Classmates
Children in Class 3-2 who have become accustomed to both the sphere and death. I find laughter again, but I didn't know that a crack was forming in it. Along the way, he meets strangers who ask for help.
Prisoners at Yongwon Penitentiary
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.
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