Li Chengqian's Original Work in the Prosperous Times of Tang Dynasty

A man from modern society traveled back to the Tang Dynasty and became the crown prince Li Chengqian. Why are they all time travellers? I don't have a system. But what happens after that? Look at me, the horseshoe arrangement, the cooking arrangement, all the arrangements for future generations. I want the dragon flag of the Tang Dynasty to be planted all over the world. -------This is a long, unsystematic and slow-paced novel. See how Li Chengqian gradually became the master of the world and was worshiped by all nations.