Storyline:For decades, humankind has been forced to seek protection in a vast underground bunker system from overpowering and sinister alien creatures that have attacked Earth. One day the young military recruit S.U.M. 1 (Ivan Rheon) was sent to the surface to protect the last survivors living in a remote forest. He takes a stand on the watchtower of a security circle, where he leads a solitary, routine life. But the 100-day mission gradually pushes him to the limits of his mind and questions his view of reality: do the alien invaders even exist, or have he and his comrades all been lied to? It begins an existential struggle for survival through paranoia and isolation ...

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