The Moon The Embraces The Sun is not depressing. It has sad moments that will make you cry (if you're an emotional watcher) but what drama doesn't? Over all, it's a fun watch and has a really good ending. I'd give it a shot.
I also liked Bachelor's Vegetable Store, so I think that might be worth a shot as well. It has a good romance in it. Your taste is dramas differs from mine in some ways, so just keep that in mind. XD
The Greatest Love is light hearted and funny, it also has a good romance in it. Don't be fooled by the look of the leads right away, you'll fall in love with them fast and not regret it.
Can You Hear My Heart awesome story and adorable romance. There's drama in it of course, but over all, it leaves you happy.
Arang And The Magistrate it's a decent story and has a good romance, not one of my favorites, but again, our tastes vary a little, so you might enjoy it.
You've seen a lot more dramas than I have, so I don't know if I suggested any that you've already seen for sure, I tried not to. XD I hope these helped a little. ^.^ Let me know if they did or not! :D Good luck!