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When mysterious alien spheres start invading the world, high school students are called upon to join the world’s first war against extraterrestrial forces.
Season 1
Shin Hyun-soo
Kim Ki-hae
Lim Se-mi
Ahn Do-gyu
Kim Su-gyeom
Woo Min-kyu
Yeo Joo-ha
Ahn Da-eun
Lee Yeon
Kim Min-cheol
Kwon Eun-bin
Moon Sang-min
Choi Moon-hee
Kim So-hee
Ro Jong-hyun
Ji Min-hyuk
Yoon Jong-bin
Shin Su-hyun
Hong Xa-bin
Shin Hye-ji