Since you liked The Greatest Love and have Master's Sun on your currently watching list then you might like another one of Hong sisters,
My Girlfriend is a Gumiho.
If you by some chance don't like it right from the start (first ten-fifteen minutes) don't give up so easily, watch whole episode. For some reason this happens to some people, it happened to me too. I put it on hold because of it but later I restarted it and it is now one of my favorites of Hong sisters dramas.