I started to watch it because of Uhm Ki Joon. I wanted to see him in action playing a good character. And I wasn't disappointed. But firstly about story. Despite the fact that it was just 10 episodes it was so intense I've bitten my nails! It was extremely exciting to uncover this mystery with other characters. This story was complex and so realistic without embellishments. I was so scared for characters and worried about them. I especially liked Kim In Chul. My heart sank for him. As for acting it was really good. I enjoyed watching their playing. Uhm Ki Joon was great. His play is so perfect. He played with his eyes, his voice, his face. It was pleasure really. I also enjoyed Hyun Woo. His character spoke to me and I wanted to protect him so bad. I liked "foreigners". But I must admit it was kind of funny, when they speak English and Koreans speak Korean and there's no problem in understanding. And finally I enjoyed watching Woo Yong. I wish there was more of him. But alas. As for music. It was modern, tense and dramatic. Just like the drama. The drama is not without disadvantages but the story is good. The finale also is so dramatic I wanna cry but it's also sort of right. My final verdict is that the drama is worth watching, it was good, interesting story with good acting. What not to like? A little logic would be ideal but one shouldn't look a gift horse in the mouth. And I hope for the second season. There are some unanswered questions.