In that case I would also add Weightlifting Fairy Kim Bok Joo and Healer. In both cases the FL starts out with a bit of a crush on an older male character (not one of her peers), but later on falls for the ML. WFKBJ is a university drama, and in Healer the FL is young, but it's a workplace drama.
Actually I'll also add Coffee Prince and Sound of the Desert. In both dramas the FL starts out with feelings for one main character, but later falls for the ML. Coffee Prince is a coffee shop gender-bender drama, and Sound of the Desert is a Chinese historical drama.