In 211 BC, Zhang Yunyang went to work as a corvee in Lishan Mountain, just over a year before the death of the First Emperor.
There are no adventures, just chemical notes and historical memories: filtering water to prevent epidemics attracts attention, changing meteorite inscriptions to meet the First Emperor, and unraveling the scam of elixir refining to extend his life. They cast steel swords, made gunpowder, and made compasses to strengthen the Qin army through technology; they built canals, improved plows, and built buildings and ships to consolidate the foundation of people's livelihood.
From the first roar of gunpowder in Xianyang Palace to the deployment of war flags across Europe and Asia. Zhang Yunyang bowed: "Your Majesty, the foundation of the world has been extended to the horizon.
It's beautiful!