In a world where the remnants of civilization depend on the Awakened, humans with special powers, to fend off otherworldly monsters, Kim Sunwoo is forced to survive as a mere guide for the Awakened. Just when he thinks his nightmarish days will never end, he's given a mission to protect one of the few remaining safe cities in exchange for a better life. It is then that a strange voice echoes in his head, and he discovers a power that could change the course of the war against monsters forever.