The Old Lord of the Tang Dynasty

When you can really travel back in time, which dynasty will you choose to travel to? Is it the Ming Dynasty, where the emperor guards the country, or the Han Dynasty, where the wolf lives in Xu? Maybe you will say: "Give me a fast-traveling and invincible God of War technology system, and I will make the whole world speak Chinese!" But is reality always so magical? Time travel is also a strange thing, and no one will make any preparations for such an illusory thing. For example, Jingyue Xuanmou was extremely disappointed with his life and decided to commit suicide. You must know that you will die after passing through the first seven chapters. He will definitely remember the gunpowder formula clearly! Too bad he didn't. I can only accept myself in a daze, and my inexplicable new life. (The author is not a history major and has some historical errors. Readers are kindly requested to point them out.)