I won't say this drama is the best, but it's still very interesting and kept me waiting for each episode. It was really confusing at times but by the end everything was explained well so I don't really mind all the confusion. It just made the drama even more thrilling. It kept me on edge throughout and made me use my brain to its maximum capacity. All the plot twists and the possibility of anyone, even the least expected ones, being the villain made me pay attention to every little detail and not forget anyone. I don't think any other drama had me use my brain this much.

Not only the story but the actors were really good as well. Yoo Seung Ho and Lee Se Young did a great job portraying their characters. All the other actors did a good job as well. I especially liked Lee Se Young's character a lot.

The chemistry between Lee Se Young and Yoo Seung Ho was really good even though there was no romance. That's another thing I liked about this drama. There was no romance at all between the main characters. I wouldn't have minded if there was but I think it would've been a bit out of place to squeeze in romance between all those chaos. And I also liked the dynamic between all the other characters as well. They made the tense atmosphere a bit more light at times.

The OSTs are probably the only thing that didn't really make much impression on me. It was not bad though. Just not my favourite. It still did match with the thrilling atmosphere of the drama.

I know this drama may not be for everyone but if you are willing to work your brain and sit through total confusion and twists and turns every episode for 16 episodes you might probably like it.