I don't really give bad ratings or write bad reviews for k-dramas, because maybe I didn't get right what the idea was, or the metaphors used, or... whatever. I don't want to negatively inspire other people to avoid watching it, because maybe it's exactly their genre and style. I have seen on some discussion sites plenty of completely, but completely contradictory opinions. I loved this series. And here is why:

1. Park So-Dam and the boys played really well (oh well, the truth is that I didn't watch too many dramas with mediocre acting, let aside bad one).
2. The story is really good and solid (by solid I mean consistent, with no unnecessary twists and nonsenses).
3. The main musical theme is really good and sticks with you (like the ones from One Spring Night or Encounter).
4. There are negative characters (obviously, it's a Cinderella theme), but except from the classic ones, the others are just mild).
5. Female lead's positivity despite the problems she faces is very inspiring.