Jesus Christ...! Let me tell you: this is crazy. One of the most intriguing and suspenseful dramas I have ever watched. Mostly because of the main character. Seo In Guk is spectacular. It's maybe the best acting I have ever seen in a drama series. He just nailed that character which means something when a character is that complex. The way he talked, his facial expressions – everything was just perfect. This series haunts you even after you finish it.
The acting, the way the story was told (the dialogues!), the music, the production – this is beyond great.
The only problem: the plot is paper-thin if you look at it from a distance. It doesn't bother you while watching the series. The drama is so well made that you are longing for more and more ... But after finishing it, you really wonder why it had to be like this. Why certain things happened. You feel like it could have been avoided all together.
It seems this series is a remake of a Japanese drama. They changed a very important part of the plot and I feel like if they hadn't done that, the plot would make more sense. I don't want to spoil, but the motives and the behavior of the brother of the female lead made no sense. They tried to explain it later on, but it didn't convince me at all.
Overall this drama is too great to not rate it very high. I watched it until the end and didn't skip a scene. I even plan on watching it again, just to enjoy Seo In Guk's great acting. His co-star was good too, of course. Jung So Min always delivers. I would love to see those too again in a drama.