[May contain a tiny spoiler]
This one is very unusual drama, witch will take you to a great ride! Especially if you are tired from cheesy cliche romcoms! If you're here for romance, you won't get 100% of it, romance is not the principal line! If you are here for sci-fi and action, you'll definitely love it! If you're not that much of sci-fi, you'll love it too, because sci-fi in this drama is not sci-fi you usually see ( robots, aliens etc..), it's something that haven't been done before! Plus sci-fi line is blended pretty well with the other lines, so you'll get all of it in one package..
The main star of this drama is definitely Jin Woo, played by Hyun Bin! He was amazing, and carried his scenes perfectly! I didn't like him so much before, but in this drama I was smitten by him! He starts as a typical kdrama rich male lead- a little full of himself, a little jerk, but I promise, you'll change your opinion about him after a few episodes! This story is totally his story, almost to the point he was the only lead in this drama, and the others were supporting..
Can't say a lot about Park Shin Hye here - exactly because of the reasons I just said - her role wasn't strong enough like the male lead role, she was more like second to him.. We all know, she is good actress, don't think I have to mention it, it's just her character here was overshadowed by the male lead.
Chanyeol ( no one mentioned him, so I wanna say a few words) - he also didn't get much spot, his character appeared mostly in flashbacks, untill the final episodes, but what he did, he did good! He totally transformed into geeky introverted computer genius, if I didn't know him well, I would never recognize Park Chanyeol in this character! :) But ( it's one of the things I wanted to complain to the writers) I wish his character gets a little bit more important scenes, because he started as important one, but ended being the guy from the flashbacks :)
The music was beautiful, especially the 1st ost , Little Prince, and Memories Of The Alhambra, played by Spanish guitar! I won't forget the creepy scene that was accompanied by this song! :)
Overall I really liked it, it was so original, non heavy, non cheesy, suspense was on point- I never knew what is going to happen next - I really enjoyed my ride with this drama! There were many complaints about the ending - I do think it was weaker than the entire drama, but it was still good, and non cliche..
Please, at least give it a try, because if you won't , you'll miss something special!