I want to read it so bad, but i am difficult dinding it, sorry for my bad English, it is not my first language
Are you talking about this one: 赤狐书生 (aka Soul Snatcher)? That's the movie. The novel is called 春江花月夜 by 多多 and it's BL, according to the articles about the movie. If you type "春江花月夜 多多" in the search bar, you'll find a large number of what I assume to be Chinese raw aggregators with the novel, for example, this one. However, I don't believe there is an English translation of it, so far, so you'll have to MTL it.
It’s other name is spring rive flowers in moonlight it also has a manhua Translated English mantua link https://mangadex.org/title/48124/spring-river-flowers-and-moonlight Raws https://www.kuaikanmanhua.com/web/topic/1184/