Son-In-Law, Another Son-In-Law?

This is a cliché story about a son-in-law. The every move of Cheng Yuan, a poor scholar from a mountain village, will be written into a book called "Book of Hundreds of Worlds". "The Book of Hundreds of Worlds? Is the next book called the Keke Book?" Cheng Yuan complained silently. (Multiple female protagonists, systematic writing, book-copying style, don't complain if you don't like it, only explain and don't talk back)