Carrying a Rifle and Returning to the Ming Dynasty

While traveling through time, I saved a little princess and accidentally offended all the ministers. Jinyiwei Lao wanted to kill him, Dongchang wanted to keep his property for him, and the emperor wanted to sharpen his edges. Now that you've provoked someone, there's nothing to worry about, just give it a try! Don't you know how to get involved in officialdom? Then hit your boss. Are the officers and soldiers too bad? Then build a private army. Do you have any cold weapons? Build a gunpowder factory. Civil War? Make guns. In this era when imperial power was declining and parties within the court were forming for personal gain, he stood on the emperor's side. Not for anything else, just because there is a little princess pestering him, a young prince who trusts him, and a royal princess who wants to marry him. --- Tell the story in the shortest sentences, and the writing style is just a blur.