[Image not from actual drama—for visual tone only.]
Why were 3rd grade high school students asked to be drafted as reserve forces and even given rifles to fight aliens?????!
Kids are kids.
It is tough for the students to accept it easily when they just get to know that they need to fight with dangerous aliens at the risk of losing their own lives. Even though it's hard for the viewers to watch, let's remember that they are just kids being kids when they are crying, whining, asking for their parents, and demanding to be sent home.
Highlighting the importance of transparency in communication.
Bad communication can cause misunderstanding, be perceived as dishonesty or shady, and hence break the trust one has in the other party.
A coming-of-age genre drama.
We will feel proud watching their growth—from whining kids into reserve force that is greatly skillful in killing aliens using rifles.
Kids are kids.
It is tough for the students to accept it easily when they just get to know that they need to fight with dangerous aliens at the risk of losing their own lives. Even though it's hard for the viewers to watch, let's remember that they are just kids being kids when they are crying, whining, asking for their parents, and demanding to be sent home.
Highlighting the importance of transparency in communication.
Bad communication can cause misunderstanding, be perceived as dishonesty or shady, and hence break the trust one has in the other party.
A coming-of-age genre drama.
We will feel proud watching their growth—from whining kids into reserve force that is greatly skillful in killing aliens using rifles.

[Image not from actual drama—for visual tone only.]
[Photo credit: Kim Leary.]
A thriller.
At the beginning of the drama, most of the students are easy prey for the aliens. As the story progresses, they do their best to avoid falling prey and becoming the aliens' food. This drama keeps viewers immersed in high tension, worrying about the characters' fate and thus successfully keeping people's adrenaline levels high from episode to episode.
Catastrophe caused by alien invasion.
Crisis does not care who you are. When it happens, no one is immune, and everyone is forced into the same deadly situation. Even high schoolers need to pick themselves up and fight against the odds if they want to stay alive in a world of alien predators hunting them for food.
By the end of the story, viewers will be shocked by a sudden dangerous threat that's surprisingly not coming from the aliens, and the lives of Class 3-2 students are gravely being put in danger. What could be more fatally threatening than human-eating aliens? A betrayal from within.
Cast:
Im Se-mi, Shin Hyun-Soo, Lee Soon-Won, Kim Ki-Hae, Kim Min-Chul, Kim Su-Gyeom, Moon Sang-Min, Ahn Do-Kyu, Woo Min-Kyu, Yoon Jong-Bin, Ji Min-Hyuk, Hong Xa-Bin, Ro Jong-Hyun, Yeo Joo-Ha, Choi Moon-Hee, Kwon Eun-Bin, Kim So-Hee, Kim Jung-Lan, Shin Soo-Hyun, Oh Se-Eun, Lee Yeon, Hwang Se-In.