It's all there. It has great potential but it's 2006 drama so very as per that time, in quality and pace. It is one of those stories which requires u to be in the mood for major underdog behaviour by the female lead. U can watch it till EP 12 or so but after that u get pissed with the female lead for letting herself be picked on.
The acting is good. The plot had potential that is why there is a remake coming out this year. It's better to wait for the remake that watch this, but if u can't wait be prepared to skip a lot towards the end.