Romance dramas without angst are rare. But I second the rec for Reply 1997. It's not heavy on the angst/melo and it's a really sweet friends-to-lovers story. Watch it when you're bored of kdrama cliches. Other than that, I suggest:
Coffee Prince
I Hear Your Voice
Pride
Full House Take 2
Smile, You (45 eps long, but the couple's got one of the best natural chemistry I've seen)
It's Okay, That's Love
Secret Garden, Autumn's Concerto and Secret contain angst but are worth it.