Xiao Ren's time-travel was not only for survival, but also to change the historical trajectory of the rapid downfall of the Qin Dynasty. He was well aware that the downfall of the Qin Dynasty was not due to tyranny, but rather due to rigidity and the crisis of the successor. After surviving the pursuit and killing by the assassins, he did not rush to resist but chose to enter politics. He used his knowledge of chemistry to solve the problems of food supply and weapon rusting in the Qin army's logistics, and won the appreciation of the First Emperor. However, as the power of Zhao Gao expanded, Xiao Ren realized that technology could not save the empire, only the system could. He began to secretly promote the improvement of the "prefecture-county system" and the reform of the legal system, attempting to find a balance between imperial power and the power of the prime minister. He used his knowledge of chemistry to create "sky fire", demonstrating miracles before the First Emperor to obtain the power to implement the new policies. He supported Fusu and opposed Hu Hai and Zhao Gao. This was a political experiment spanning thousands of years, and Xiao Ren intended to transform the ancient empire with modern thinking. When the tragedy of the sand dune chariot dismemberment was about to repeat, could he, at the critical moment, turn the tide and prevent the collapse of the Qin Dynasty and establish a powerful dynasty that would last for thousands of years?