The Lover for comedy, depends on your type of humor though. I heard History of a Salaryman is hilarious as well, so I'll recommend that, too.
They are both not "girl disguises as a guy"-dramas, though (sorry!).. I just can't think of any that are that good :/
I want to watch a drama with smart as well as capable characters in it. I heard Innocent Man and Queen Seon Duk fit into these criteria especially well. Can anyone confirm this? Or is there something else I need to watch? No whiny female/male leads please.