I can't believe no one has posted a review on this amazing and underrated drama! I really believe a lot of people on MDL should give this a try. Story The story of this drama is about a terrorist who calls himself the Pied Piper. This terrorist is controlling people to commit and act of terror. A negotiation team is set up and the two main protagonists in this drama both lost a loved one from one such act. The story is really great and and the drama unfolds itself with each episode. And every episode the tension is getting higher until the very end! The only reason why I'm not giving the story a 10 is that there are still side story lines I felt where not fully completed. Acting/Cast: Acting was great overall, there are a lot of experienced actors as well as new faces but everyone was good. Shin Ha Kyun like always was great at its role, but Jo Yoon Hee not so much and I really had to get used to her, the only drama I have seen her before was Nine Times Time Travel but eventually she didn't bother me that much. Music: Music was good nothing special but still pretty good Rewatch Value: I don't rate any drama for a rewatch