Yan, a student at a prestigious tech university in Korea, is on the verge of graduation. On the day of his celebration, while he and his friends are enjoying their moment, the world is abruptly thrown into chaos. The sky shakes, and a massive phenomenon occurs, followed by the appearance of terrifying beings known as the "Kings of Monsters." As the city crumbles, the police and the public scramble for safety, while Yan is caught in the middle of it all.