Da Qin: Making Gunpowder at the Beginning to Frighten Qin Shihuang

He traveled through time and became the son-in-law of a salted fish in the Qin Dynasty. He wanted to lie down but was disturbed by the birth of his daughter. Seeing that the First Emperor only had three years left to live, he was forced to show off his plans: make a plow, refine distilled wine, and research gunpowder and guns! Father-in-law Ying Zheng sat up in shock after tasting the liquor: "Xian son-in-law, you sit on the throne, and I will assist you?"