During an archaeological excavation, Chen Wang, a doctor of history, accidentally came into contact with a fragmented jade seal engraved with "Ordered by Heaven". He was drawn into the vortex of time and space by a mysterious force. When he woke up, he found that he had become Ying Wang, the youngest son of Qin King Ying Zheng, who was only twelve years old. Ying Wang uses modern historical knowledge to appear in front of Ying Zheng as a "young man with early wisdom". He first cleverly reminded Ying Zheng to guard against false eunuchs during the Lao Ai Rebellion, and then showed military strategies when suppressing the rebellion; he advised Ying Zheng to "slow down the movement of counties and counties, and first consolidate the people's hearts", and proposed an improved version of Qin law - "Penalty cannot be abolished, but punishment cannot be indiscriminate; servitude cannot be avoided, but servitude cannot be extreme." These views coincide with Ying Zheng's reflection on Legalist thought. Ying Zheng died of illness during his eastern tour, but because his physical condition had improved compared with history, he was clear-headed and explained his funeral affairs before his death, thus avoiding the chaotic situation of "secret funeral". Ying Wang successfully ascended the throne and was called the Second Emperor of Qin.
After taking the throne, Ying Wang implemented the "New Qin Policy" - retaining the framework of the county system, but abolishing harsh punishments and laws, reforming the corvee system, and resting with the people; at the same time, he did not abolish the reasonable local autonomy factors in the feudal system, and created the prototype of "parallel prefectures and states." The Qin Dynasty lasted for three hundred years under his rule, and Chinese history took a different trajectory.