Zaihe (Jin Mingmin), a medical doctor from a small staff member of a pharmaceutical company, was persuaded by his brother Zaibi (Jin Mingmin) to invest in the stock market in the early years, but lost all his money. Now he is committed to a pharmaceutical company with no prospects as a salesman, humbly outside and acting on the face of the client, the depression in his heart can only be vented to his wife and children at home. At the same time, dozens of bodies were found one after another near the Han River valley, and the whole body of the deceased was like a mummified corpse. The incident was so widespread that even the people around Zaihe were not immune. After investigation, it is found that all of the dead live with iron nematodes that should exist in insects. Iron nematodes stimulate the host's appetite to absorb nutrients, wait until the breeding period, make the host lose consciousness, throw water to commit suicide, and then enter the water to breed in large numbers. In the face of this new variety, mankind is helpless and helpless, the death toll has increased geometrically, and South Korea is in chaos, like the end of the day. Jae-hyuk, who was already struggling to make a living, how to protect his family from disaster.