Chen Du, a graduate student in the Department of History, opened his eyes and became a death row prisoner during the Zhenguan period. He was executed three days later on the charge of "liaison with the Turks."
In the Jinluan Palace, Li Shimin personally interrogated, and the Minister of Punishment produced three secret letters of collaboration with the enemy as irrefutable evidence. All civil and military officials in the court were waiting to see his head fall to the ground. Chen Du pointed at the letter and said, "Your Majesty, the grammar of this Turkic text is wrong. When the Turkic Khan receives this letter, he will first kill the person who sent it."
The whole place was dead silent.
Life was saved, but the real test had just begun. If you want to survive in Datang, it is not enough to just solve individual cases.
The official rules here are more complicated than those in the modern workplace: What should you do if your boss wears small shoes on you? How to prevent colleagues from stealing credit? If the emperor praises you today and doubts you tomorrow, how should you respond? With no background, no family background, and no faction - how can a ninth-grade official at the bottom of the Punishment Department survive to the end?
The answer is: knowledge. From modern economics to improving the tax system, to using basic chemistry to create cement, to using military theory to win border wars... Every step is a dimensionality reduction attack.
This is no ordinary time travel novel. This is a practical survival manual for grassroots officials of the Tang Dynasty - teaching you how to go from "losing your head at any time" to "no one dares to move" in the ancient officialdom.