"Doomsday Reagent" is a post-apocalyptic survival novel full of suspense and horror elements. In the dead of night under high pressure, interior designer Sun Zuyao received a mysterious package. Photos of laboratory zombies and strange reagents sent by his former genius friend Fan Zhipeng completely disrupted his numb 996 routine. When the "rabies" bite incidents began to spread in the dark alleys of the city, the hospital surveillance video mysteriously vanished. The protagonist, carrying the purple reagent that was said to be "not to be taken until in a desperate situation", embarked on a journey of escape. From the steel jungle to the rural homeland, two childhood friends with vastly different fates reunite in an astonishing way. But what is sealed in the reagent, is it a life-saving remedy or a world-destroying poison?