There's also ongoing kdrama "Just Between Lovers," which I am personally enjoying a lot...
Save Me is an excellent psychological kdrama which I adored.
I saw that you dropped Signal at ep 1, but you should really give it a second chance. I watched it recently and loved it.
Defendant is another solid crime/law drama. the villain is awesome xD
I agree that most of this year's kdramas were lackluster, so you could also possibly looks for some older dramas to binge ;-)