I really enjoyed watching High School King of Savvy, would definitely recommend that, it has a cute ending, and I didn't find even one episode boring..
Reply 1997 (the sequel isn't that good) Misaeng Ho Goo's Love Shut Up Flower Boy Band (the other Flower Boy shows aren't bad either) Nine: Nine Times Travel
are all great. Probably my favourite TV dramas. tvn has great quality because of their model of completing production before airing.