He could recommend the novel "Buddhist Miracle Doctor: Black-bellied Prince, Can't Get Rid of Him". The female protagonist was a miracle doctor from the modern era. After traveling to ancient times, she became a demoness with superb cooking skills, popularity, looks, and so on. She seemed to have an omnipotent ability, but at the same time, she was as cold and arrogant as the male protagonist. The male protagonist was a powerful demon. After being adopted by the female protagonist, he became her personal bodyguard. The interaction between the two was very interesting. I hope you like my recommendation. Muah ~