I knew I would like this drama when I saw the poster and read the synopsis. At just episode 1, I was sure I would love this drama. And now, 20 minutes after I finished the last episode, I can say I was correct. I love series and movies that are not black and white, but where you have to judge the concept of 'evil' yourself - what is too much, is revenge always bad, who is the real bad guy - things like these. The actors... oh, the actors. Im Ju Eun was way better than I expected, but the guys... Lee Seo Jin and Park Gun Il were both just awesome here. Even if the series hadn't been good, I would've finished this just for those two. I wouldn't say the genre of this is horror though - more psychological thriller, but mostly a study of humanity, in my personal opinion.