Let me recommend a few novels that meet the requirements to you! The first one is "Defiant Concubine: The Cold Demon Lord, Step aside." This fantasy romance novel has a plot where the female lead is a goddess and the male lead is a demon lord. There are also many heart-wrenching plots. I suggest you read it. There was also a book titled 'Trash Little Xie Concubine: Demon Lord, Come Fight!' It was also a fantasy romance novel. At first, the female lead was considered a good-for-nothing, but later she cultivated both medicine and martial arts and abused trash together with the Demon Lord. I hope you like my recommendation, Mwah ~😗