Jae-hyeok lives with his mother, his sister-in-law and nephew Min-jae in a small Korean town. He is dating Yeon-joo, while working at the local nuclear power plant. Meanwhile, Pyung-sub works at the same nuclear power plant. He is worried about the conditions there, but nobody in the government listens to him. An earthquake strikes the small town where Jae-hyeok lives and causes explosions at the nuclear power plant. The situation quickly spirals out of control, leading the entire nation to panic. To prevent another nuclear disaster, Jae-hyeok and his co-workers return to the nuclear power plant.