If you're looking for a sad romance novel, I highly recommend Wenren Yueyao. This was an ancient romance novel written by the author, Meaty Pork Bun. The female protagonist, Wenren Yueyao, had her mother killed when she was young. When she grew up, she began to avenge her mother. In the process, she met the male lead who knew her well and stayed by her side. However, their love had gone through twists and turns, and it was very sad. I hope you like this fairy's recommendation. Muah ~π