Marine:
Try Delightful Girl Choon Hyang, I’m not sure if what she does can be categorized as chasing but she’s in love with him and they’re married (out of circumstance) while he’s still chasing after his first crush and it takes him looong (and an absolutely crazy sml) to realize he’s already been in love with her.
My Girl, another Hong sis drama, also def uses this trope. Again idk if you could consider what the female leads do as chasing (it’s not anything like in the Itazura na Kiss adaptations) but they love the male lead that initially is still stuck on someone else, usually for much longer than necessary.
Also, Reply 1994 kind of fits too? Not perfectly because Trash’s reason for ignoring Najung’s love is other things but technically there is an exgirlfriend he liked/loved.
I love the Reply series! I can’t remember if Trash was hung over an exgf either but their relationship was so cute.
My Girl, which version did you watch?
Delightful Girl Choon Hyang actually sounds right up there! An older drama but I like the sound of it. Thank you for the recommendations!