No, Where Did This Girlfriend Come From?

There Must Be Settings and Content About Gu. It's Best to Ask for the Famous Sayings of the Immortal Lord

I want to read a book similar to "Genshin Impact: The Pursuit of Eternal Life from Scratch".

Practicing Gu, Refining Heaven and Refining Humans. Is There Any Novel Similar to Gu Chong? It's Limited to One Book.