When it comes to romance dramas I just HAVE to recommend Weightlifting Fairy, it's not the perfect mach for what you're looking for but it's my favorite and I just can't xd Ok, so I had a really hard time finding something that you want so what I'm about to recommend is just rom-coms that are generaly on the fluffier side and the male leads aren't douches.
Attention, Love! (2017) - There's themes of unrequited love here but it's not very sad and dramatic about it. The male lead is very nice he falls in love with the female lead almost immediately. First, he loves her like his sister/friend or so he thinks...? Ahhhh, just watch it for yourself it's cute :D
Lucky Romance (2016) - the male lead is sooooooooooooooo cuuuuuuuuteeee. Honestly, all you need to know. And this drama has this subtle depth to it which is surprising but not heavy :)
My Mr. Mermaid (2017) - probably the nices male lead I've ever seen. It's really cute and sweet, the main couple gets along really well, their relationship builts from friendship to romance and both of them are genuienly very nice and hard working people. The supporting couple is what I was living for, tbh. This is worth watching cause it's a rom-com but then more than a rom-com....ya know, it has actual swimming, journalism, friendship. It's a really nice package that goes together perfectly.
The Eternal Love (2017) - again, cute fluff but with a cross-world travel twist this time! The chemistry between the main couple is unreal. The female lead is sassy and kicks ass.
I hope this helps ˚✧₊⁎( ˘ω˘ )⁎⁺˳✧༚