Hey, I have a novel to recommend to you! This novel was called "My Sister's Teacher Is My Ex-Girlfriend". The author was Yang Mian, and it was a fantasy novel. The plot described how the male protagonist met his ex-girlfriend when he was taking his sister to school, and this ex-girlfriend actually became his sister's class teacher. Therefore, there was indeed a clue in this novel that the female lead was the form teacher of the male lead's sister! I hope you like this fairy's recommendation. Muah ~😗