This Story has so much potential to become much more interesting actually. But for me the storyline is too slow, I don't understand why it takes 3 years for the leads to admit their love? Starting with what I like about this drama :
1. I like the main leads, both their visual and acting.
2. There are a wicked side of the female lead, that I wish to see more. It's fun to watch. too bad there are only shown on few last episodes.
3. The second (or third) leads love story is much more interesting actually, I enjoy it much more than the main leads'.

What I don't like about this drama :
1. the storyline is too slow, lack of sweetness between two main leads, not to mention on how they keep denying that their love to each other
2. the time difference are unclear. It suddenly jump from the first year to the second year, and then suddenly it's already three years.
3. 15 episodes are too long, I think it can be shortened.

Overall acting are OK. But I don't think I will rewatch it again. maybe if I do, I'll just fast forward a lot :)