Wan Xiaotian, a modern pancake stall owner, traveled through time due to a car accident and became Hu Hai, the second emperor of Qin who came to the throne after the Dune Revolution in 210 BC. Faced with the crisis of Zhao Gao taking power within the Qin Dynasty, the undercurrent of the old forces of the Six Kingdoms, and the Xiongnu outside, he relied on modern historical knowledge and basic science and engineering skills to break the situation: he first set up a counterattack to kill Zhao Gao, and took back the salt and iron property to scare Li Si.
He founded the prototype of the imperial examination to uplift poor families, defeated the Huns with hot-air balloon reconnaissance and crossbow formations, and married the Huns princess Luotanyun to balance diplomacy, put down the rebellion of the old aristocrats of Qi State, and developed Lingnan. In the end, the Daqin Academy of Sciences was established to promote the implementation of technologies such as papermaking and telescopes, and laid the institutional foundation to free the Qin Empire from its short-lived fate and create a "New Qin Dynasty" that would last for two hundred years. He also transformed from a pancake stall owner into a revolutionary emperor.
