I love this kind of story, and i am a fan of sooyoung as an actress so i expected a lot. The fact that the main actor was an awesome one (hes really good in all the dramas i have watched of him) AND the main plot line seemed catchy got me and i loved the first... idk, 10 eps. Actually i would go with a rating of 8.5 before the two last episodes. But the story gets a little bit... idk if its actually the story or the fact that you dont see an actual character development on Oh hyun jae. The end hints at some evution on him and the plot but only if they end up doing a second season (what i doubt will happen). And the end... sooyoungs character sometimes is too much and it shows in the end (its not bad acting, since i watched all her dramas and like it. So i think the writers made her a bit... its too fake... some of her dialogues and some faces seem fake etc. It would be ok for a lighter drama maybe). But i enjoyed the fact that the killer had a strong and well made personality and they didnt try to make the audience pitty him. Anyway.... its a nice drama, but it disappointed me because it could be so much better...