these are some older dramas:
Ugly Alert
Smile You
The Princess' Man
Couple or Trouble
Tamra the Island (if you can get past the first episodes it's a pretty good drama)
Spring Waltz (it has more of a moody, sad vibe to it, but it has a nice soundtrack)
Tears of Happiness (chinese version of 1 litre of tears)
Tatta Hitotsu no Koi
Zenkai Girl
newer ones:
still 17
just between lovers
marriage contract (older man/younger woman, terminal illness)