When mysterious alien spheres start invading the world, high school students are called upon to join the world’s first war against extraterrestrial forces.
Elenco: 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-chul , Kwon Eun-bin , Moon Sang-min , Choi Moon-hee , Sohee , Ro Jong-hyun , Ji Min-hyuk , Yoon Jong-bin , Shin Su-hyun , Hong Xa-bin , Shin Hye-ji , Lee Soon-won , Shin Myung-sung .