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In ancient times, reptiles on the earth evolved into lizard people, and they had advanced technological civilization. After a bomb hit the earth and caused a mass extinction of life on earth, the survivors among them built refuge areas underground to survive. After that, the temperature of the earth dropped significantly, and the ground was not suitable for them to survive. They continued to survive deep underground, close to the core of the earth. Human civilization was born after the catastrophe, and wars broke out due to internal conflicts. Only a small number of humans survived. Some humans entered primitive society and became my ancestors. A small number of humans took high technology and hid underground to set up "demon hunters" to fight against the lizard people with retained high technology. The protagonist Liu Bin, as a member of the "Devil Hunter", gradually learned the secrets of the birth of lizards and humans during his actions against the lizards.