When mysterious alien spheres start invading the world, high school students are called upon to join the world's first war against extraterrestrial forces.
Genres: Action & Adventure , Drama , Sci-Fi & Fantasy
Keywords: action , alien-invasion , apocalypse , based-on-webcomic-or-webtoon , high-school , leadership , military , monster , science-fiction , supernatural-phenomena , survival , thriller , war , watch-Korean-drama-online , tv-shows-online