In South Korea,devastation was struck by an invasion of strange monsters...which led to everyone fleeing from it.Korea was besieged by other countries.There is an organization to fight monsters that is keen to Employing young people to become warriors in exchange for the organization sending their families outside the scope of Korea.Shownu,you and many others work in this organization.During a mission,you have been trapped by the monsters but Shownu saved you at the last moment.