Both are about the complexities and difficulties of love and just of being human. Developed, well-rounded characters.
They both deal with the complexity of love maturely. They stand out as romantic dramas and are both very good, with characters who feel human and relationships that aren't superficial. Definitely recommend both.
I found myself while watching both of these shows referring back to each of them. I would think, didn't the main girl do this, but found that I was actually thinking of the other show.