STORY: The story of this drama is quite interesting and unique with its cross between medical and supernatural. This is more so medical and action rather than romance, so if you're searching for a romance packed drama, this isn't for you. There are very few dramas that deal with vampires and the idea that they are truly humans just infected with a virus is really intriguing. There are a few plot twists which were surprisingly unpredictable and caught me off guard which makes it more enjoyable. Overall, the story is different with, of course, some cliches that are present in about every drama, but still worth watching. ACTING/CAST: Ok, let me make this clear, I know what everyone is thinking: "I don't want to watch this because of Goo Hye Sun." I felt the same way when I first started watching, but she's not that bad here. Her character is very strong-willed and it kind of grows on you. I'm not saying that I loved her acting, but it wasn't horrible to the point where I couldn't stand watching her. If that's your reason for not watching this, OPEN YOUR MIND! Additionally, Ahn Jae Hyun is very new to acting and I think he did a pretty good job for a rookie. There were moments where his acting was just a bit too... well not good enough and sometimes I found myself laughing at how awkward it was. But the majority of the time, he did a well enough job. MUSIC: You know those OST's where it's so catchy that you find yourself humming it throughout the day for weeks even after the drama has ended? Well... this is not one of those. I enjoyed the music while watching the drama, but none of them really stuck. That's the only reason for its low rating, but from what I remember, none of them were annoying so I thought they did a decent job here. REWATCH VALUE: Yeah, this isn't the type of drama you'd like to rewatch. Maybe you might enjoy rewatching the rare romance scenes or some of the action scenes, but it's not really worth rewatching unless you want to take a trip down memory lane (the downtown region). OVERALL: Overall, this was a decent drama but due to certain plot twists and loose strings at the end, it's value significantly decreased. I want to say that i thoroughly enjoyed every bit of this drama, but I just can't. Some things happened which I think were just uncalled for and unnecessary (why screenwriters?) which I just won't be able to forgive and forget. There are good times, but to me, the bad times overpowered them.