Currently God's Gift - 14 Days is pretty awesome. Sageuk fans have Empress Ki which is bringing in really good ratings - together these two got an upcoming drama Big Man pushed back since they don't want to compete with that (Full Sun is doing badly...)! For some more mature stuff, Secret Love Affair is the current cable hit.
Recently ended Let's Eat was a good comedy, while Miss Korea was a refreshing look to beauty industries. But of course, You Who Came from the Stars was a huge hit everyone loved. A must-see, I'd say - there will be a lot of references back to this one! Secret is a pretty good watch from late-2013.
Also, ongoing shows are always great for getting back to the scene and luckily there's gonna be a bunch of dramas starting soon. I've marked down Gap Dong, Big Man, Hotel King, Witch's Love, Flower Grandpa Investigation Unit and Triangle down for myself, but I'm sure there's plenty of other stuff coming soon.