I love stories that take horror or supernatural concepts and make them seem perfectly normal. This has all the ingredients that I usually like in a drama, yet somehow Blood completely missed the mark for me. I loved the concept of a vampire surgeon, and thought the blood virus was a cool idea, but it was clear early on that the writer had no idea where the actual story was heading, and 20 episodes later I was left, confused, annoyed, and unsatisfied. Ahn Jae Hyeon plays the vampire doc Park Ji Sang, and he does a good job coming across as cold, and wise, yet eternally youthful ... which makes him a good pick for a vampire I guess. His costar Goo Hye Sun plays his rival turned love interest, and I thought she was pretty good playing the arrogant Yoo Ri Ta. I actually thought they both did a fine job bringing their characters to life, though neither was particularly charming (even with his occasional smirk). The major problem for me was their complete lack of any chemistry whatsoever. Zero. Nada. If they kissed, which I think they did, I totally forgot it, because that's how much I cared. I wanted to see two cold characters warm up to each other and eventually heat up the screen. Instead I saw two actors sometimes hug, and suddenly I'm supposed to believe they are in love. Well, I didn't, which ruins the epic fairytale romance idea that a lot of the story was counting on. As a romance, this failed miserably for me. As for the rest of the cast, one of my favorite characters was Jung Hae In, who I would have liked to see have more screen time (even if that meant seeing more of the stupid robot). He should have been a way more important character to the story overall, but instead he's comic relief until those few moments when he briefly explains something, or he's used for bait. His backstory even seemed like it was thrown in at the last minute. Plus his romance was much more believable than the main couple, and more fun to watch. How poorly they treated his story line is my main reason for turning on this drama completely, but I'll try to focus on a few more positives before I trash the show completely. The show's real star is Ji Jin Hee. He's complicated, awesome to watch, kept me in suspense, and is the main reason I kept watching. I also felt similarly about Son Soo Hyeon. She even has better chemistry with the leading man than Goo Hye Sun does. I won't go into details about either character, because I don't want to spoil the best part of the show in my opinion. Some of the patient stories were entertaining, but I'll say that without these two actors I would have dropped Blood a long time ago. The rest of the cast was fine, did their best with what was written, and made the sloppiest parts of the story at least watchable. I gave the story 5 out of 10 because although it was a great idea, what was written was disjointed, overly complicated, and at some points completely ridiculous. The over the top music did not help either. During the last few episodes smart characters suddenly did the stupidest things, secrets seemed to be revealed just for shock value, and none of the complicated concepts introduced were ever explained or resolved in a way that made any sense. Several times the story aims to make the audience cry - like use a whole tissue box cry - but instead I literally watched those episodes with a dry eyed blank stare, and the entire last episode with a confused look. This is one of the worst KDrama endings I've seen in a while, and so much suspense was built up in the first half, and well, that by the time I got to the last episodes I was majorly disappointed. Overall this drama starts off interesting, peeks your interest enough to keep you watching, but goes completely down hill and off the track by the end. I know some people like the idea that a drama may come back with a second season, but I would have preferred a satisfying ending, or at least one that made sense. As for whether or not you should watch Blood... I say skip it. I know I wouldn't watch it again. It's not terrible, but it's not good. It fails as a romance. It's not well conceived as a suspense story. It gets kinda boring for a hospital drama too... in fact it's like they forgot all bout the hospital at the end which makes no sense since about 90% of the drama takes place there. Maybe this would have been better as a movie, and stretching the story to 20 episodes is what made it so bad. There are way too many vampire stories out there to waste time on a bad one, and this one definitely... (wait for it) ...sucked!