Da Qin: My Name Is Hu Hai, and I Am Plotting a Rebellion.

An accident caused a doctor of psychology to become Hu Hai, the second emperor of Qin. In order to survive, he could only plot a "rebellion" to kill Zhao Gao, then pacify Xiang Yu, destroy Liu Bang, shock the barbarians, reduce taxes, promote science and technology, and focus on people's livelihood, to create the unique Qin Empire! Who said that Great Qin would perish in two generations? I, Hu Hai, want it to be passed on to all generations! (This book is an imaginary history and may differ from the official history, so please understand and don't criticize if you don't like it)