True, she sucks. It's a mixture of her being immature due to her young age and her being inconsiderate of other people's feelings like her best guy friend, who she uses constantly. And as you said, she was callous to her mother who'd done everything for her
The music was perfect indeed! And that's about all the good things I can say for this dragging, boring as hell drama. No, I liked the romance between the mother and her employee. Anyway, it's baffling to me how this show has good reviews here, it was so lifeless and lacking any tension between the leads, I fast forwarded most of their scenes. They gave us nothing. Sure, they were pretty but every scene of them together I cringed. Only the music and the gorgeous cinematography made it somewhat worthwhile to watch