In 221 BC, a stranger named Chen Yan suddenly appeared in Xianyang Palace. Facing Ying Zheng's bronze sword, he raised his voice and said: "Your Majesty wants to spread the word to all generations. It is not just Kyushu that should be unified?"
Chen Yan used the sand table to teach him skills: improved farm tools doubled Guanzhong's yield per mu, and blast furnace ironmaking made the Qin army's armor indestructible. What's even more astonishing is that he rolled out the sheepskin and outlined the outline of the outside world: "To the east is the Island of the Rising Sun, to the south is the land of spices, and to the west is ten times the land and gold."
Ying Zheng then ordered Meng Tian to lead the "Ocean-Ocean Army" to set sail, bringing with him the compass and seawater distiller created by Chen Yan. In the past ten years, Da Qin's ships crossed the sea and marched eastward, and their cavalry traveled all over Central Asia. Lingnan sugar became a treasure in the Western Regions and traveled thousands of miles away.
Hundreds of years later, Roman envoys arrived in Xianyang and saw this empire that spanned Europe and Asia: post roads and mail trains were constantly running, documents were all written in Qin seal script, and "Great Qin Code" stone tablets were erected throughout the provinces. The archives record the "future wise man" who made the word "Qin" the most important footnote in world history and truly fulfilled Ying Zheng's vow to "pass it on to all generations."
