This fantasy novel was called "Covering the Sky." The male protagonist was called Ye Fan, and the female protagonist was Ling 'er, a spirit separation of the spirit race. He even took a demon girl, Hefick, as his sister. This novel told the story of Ye Fan's growth in the Heaven Covering World and gradually revealed the secret of the Heaven Covering World. I recommend the novel, Mortal Cultivation Legend, which is similar to this novel. It tells the story of an ordinary person who went from a mortal to an immortal cultivator. I hope you like this fairy's recommendation. Muah ~😗