After Living in Seclusion for Fifteen Years, I Was Regarded as a Unicorn by the First Emperor

My soul traveled through the Qin Dynasty, and I became Gongzi Xuan, the illegitimate son of the First Emperor of Qin who was declared to have died young. In order to save my life, I pretended to be a madman outside Xianyang City for fifteen years, hoping to survive until the troubled times ended. Unexpectedly, on the night of time travel, the sign-in system was activated! Making ice, making plows, boiling sugar, making paper... Modern knowledge is directly available! The First Emperor paid a private visit incognito, under the pseudonym Lao Zhao, and I said bluntly on the spot: "Your Majesty is addicted to the golden elixir and will not survive for two years. The Qin Dynasty will be in chaos within two years!" I thought I was just going to make a comment, but my words revealed a hidden problem! Ying Zheng was horrified: "How did you know that I was infected with erysipelas?!" I casually demonstrated how to make ice with saltpeter, plow the soil with a curved shaft, and also presented some amazing strategies for papermaking and governing the country through public opinion. Mr. Ying Zheng burst into tears: The idiot I had hidden for fifteen years turned out to be a unicorn descended from heaven! From then on, the First Emperor came to eat in disguise every day, begging me to save Da Qin and save his life!