When this show ended, the first thing I thought was: "Bummer". And no, not because I was sorry it was finished, but because it was the clear example of a missed opportunity to make a good drama.
This show was very promising at the beginning (the first 2/3 episodes were very funny, mature, even a bit spicy, with some sort of Sex And The City vibe) but, IMHO, it loses its sense of humour along the way, to the point that I started to find it really boring: too repetitive and the story drags itself out too much, particularly towards the end.
The two leads, for me. were the only saving grace. especially Jang Nara: she is definitively one of my favourite Korean actresses. Love her!