Li Xuan traveled through the Tang Dynasty and became the prodigal son of the Li Jing family. He owes gambling debts, drinks wine, and his fiancée is clamoring to break off the engagement. Everyone thinks he is trash.
Until he was in the princess's mansion, using three strategies to make everyone stupid. Until he used an account to make the prime minister look bad in the Taiji Palace.
Until the Turks came to the city, he squatted on the city wall and lit a cigarette: "Cavalry, right? Have you ever seen landmines?" Doesn't exist.
This world does not allow people to lie down. Then don't blame him for bringing the Tang Dynasty into the Industrial Revolution a thousand years ahead of schedule.