What's Wrong With Secretary Kim - I never finished it as it was a bit too romancey for me lol. But from what I watched there was good chemistry between main leads. First drama I thought of when I saw you examples. Same actor from Fight For My Way as well.
Just Between Lovers- It's an amazing story with the most pure relationship I've ever seen. wholesome, vibes as it's about main leads supporting and opening up to each other due to their (very tragic) past traumas. Perfect show if you want a soft, realistic drama about ordinary people finding their place in life and relationships! (ticks all the boxes your looking for except it's slightly melodramatic but that's what makes it best IMO)
Come And Hug Me - Similar to JBL, in the sense that it's about main leads working together to overcome past traumas. About a ML police officer so plenty of mystery and crime! Although I would say it is centred more around the main couple and their beautiful relationship. Awesome actors as well!
W - This one is awesome!!! Creative and unique plot, I was hooked every single episode. May be a little action packed, but it works really well with the story. Chemistry between couples was through the roof! No love triangles, no SML, just two characters who care deeply about each other!
I hope those recs help! I know they're very popular drama's so I hope there one that you haven't watched lol. I'm more of a melodramatic, darker drama watcher so I may not have any knowledge of the vibe your looking for. I'll probs come back to update if I think of anything else :)