The Forbidden Flower (2023)

In both dramas, one of the main characters gets terminally ill. And they wish to be loved by someone before they die. and they chased that person.

Older male /young female , more kissing scenes female takes initiative first and same female lead , cute scenes, quiet male lead

Esta es sobre un profesor que le termina gustando su alumna diferencia de 12 años aproximadamente. Lo mismo sucederia con mi pequeña boda otra pelicula sobre una relacion profesor -alumno,

there's no age gap in IOTNBO but in both dramas:
- the FL is rich (and has a great wardrobe) + has been sheltered (personalities differ though)
- FL pursues ML first and relentlessly chases after him
- has a ML who has things holding him back from starting a relationship with FL (in TFF its age gap and his responsibility as an adult, in IOTNBO its his responsibilities and her personality).
- both have great chemistry between leads
other than that plot varies wildly, but I think it's a good rec to keep in mind if you run out of directly similar ones.