I realized I've never seen dramas about the couple first breaking up, and then one of them trying harder than ever to get back together. Any recs?

Go back couple 

Cunning Single Lady - here they are divorced but something happens and she is applying for a job in his firm and thus they get thrown back together.
Welcome to Samdal-ri - broken up, but still feel things for one another.
I need Romance 2 -  two best friends that were in a relationship, then broke up but always loved one another.

Familiar Wife

Lovestruck in the City