There's a novel where a man called Bai MubeiI'm not sure which novel you're referring to because I don't know which character you're referring to. If you can provide more information such as the subject matter, genre, author,...
There's a novel where a man called Gu XuAccording to my knowledge of online novels, there is currently no novel with a male protagonist named Gu Xu. Perhaps you have more specific information about the name or content...