韩半岛6.1级地震之后,引发了位于釜山地区的1号原子能发电站爆炸,核电站陷入了危机。大规模强震引发的爆炸导致核电站出现裂缝,放射性物质泄漏事故发生。毫无预警的灾难,令韩半岛被混乱恐慌笼罩。就连一直坚信可以预警灾难的塔台也处于即将颠覆的状态。核能泄露的恐怖渐渐席卷而来,甚至还可能诱发第二次爆炸。核电站工作人员与居民、消防人员展开救灾行动,然而下一轮爆炸的威胁已经袭来。Jae-Hyeok (Kim Nam-Gil) lives with his mother (Kim Young-Ae), his sister-in-law (Moon Jeong-Hee) and nephew Min-Jae (Bae Gang-Yoo) in a small Korean town. He is dating Yeon-Joo (Kim Joo-Hyun), while working at the local nuclear power plant. Meanwhile, Pyung-Sub (Jung Jin-Young) works at the same nuclear power plant. He is worried about 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.