Hi Dani
There are a couple of others that come to mind, namely
I need Romance 3
City Hall
The Greatest Love
Witch's Romance
Secret Love Affair (When they play the piano together it's amazing. May be not everybody's cup of tea and no rom-com, but I loved it.)
Kimi Wa Petto
Heart to Heart
Marriage not Dating
Que Sera Sera
I also need to mention 'Cruel City', because although it is not a romance drama it has one if not the best kiss scene of any k-drama I have ever seen,
Enjoy, Luna