Splash Splash LOVE (It was a two episode special, but I thought it was really well done and highly recommend it!)
Noble, My Love (It's 20 episodes, but each episode is only 15 minutes. It's kind of like a silly, cutesy endeavor and I really enjoyed it)
I'll echo what others have said about
Kill Me, Heal Me. It took me a bit to get into it (and I see you put it on hold after episode 5), but it really is one of the best constructed k-dramas I've seen in 2015.
And
Healer was more 2014 than 2015, but I see you don't have it on your list and I agree with others, definitely something that is a necessity to watch.