Mature strong relationships

I just really need something with a strong couple. I’m tired of seeing these couples that fall in love just magically because their gaze is pretty or something. I love it when the main characters actually spend time together, they see each other’s flaws and help each other out. I love that one trope where the girl is strong and the guy is like “I know you can do it on your own but let me help you”. Some dramas I think do this really well are The Legend of Shen Li and The Flourished Peony. (I prefer costume dramas!) Please send your recommendations my way!