I recommend 'I Live with a Demon' to you! This was a Xianxia-Cultivation Civilization novel. The male protagonist had a pure Yang body and a female ghost attached to his body. It was a pure Yin body. The female ghost absorbed the male protagonist's Yang Qi and could level up. They cultivated together, experienced all kinds of hardships, and finally embarked on the path of cultivation of ghosts and gods. I hope you like this fairy's recommendation. Muah ~😗