Saving All Mankind Starting from the Tang Dynasty

In 1974 AD, Arecibo, the largest radio telescope in the Lighthouse Country, sent a stream of information to the center of the globular star cluster M13 in the deep universe 250,000 light-years away from the Earth. The information includes the chemical formula of human gene DNA nucleotides, the double helix structure of human DNA, and information about the earth. This message is called the Arecibo message. More than a thousand years later, in the summer of 3020. Everyone around the world received a message at the same time: "Finally found you!" "Earth..." "Humans..." After a rain of blood, human beings disappeared directly from the earth... … Li Cheng discovered that he could travel back and forth between Datang and 3020. As long as you work hard to promote the development and progress of Datang, you can influence the scientific and technological civilization of mankind on earth in 2020. Ever since, Li Cheng had his only mission... Revitalize the Tang Dynasty and fill up the technological tree of the Tang Dynasty... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.