At beginning, the drama started a bit weak, but when half of the drama arrived, it started to have a lot of tension every episode. It really doesn't have many romance, but you can see how the main actor & actress feel about each other Seo In Guk surprised me, I always watched his other dramas/movies but he was unexpected in this one. He did it very good! I think he can be even better with time. About Jang Na Ra, she's still the best, she didn't disappointed me. Park Bo Gum was the best of all the cast, he's acting is simply perfect! It was my first time seeing him acting, and I turned his fan, I will search for other dramas he did. His role was essential, I think nobody than him could do this role. Choi Won Young did a perfect perfomance as Lee Jun Ho, he was creppy but it was so good. I personally recommend the drama, even if the beginning is a bit slow and obvious, you won't know what will happen. What I will say can be considered a Spoiler.... ****(SPOILER)**** The end was opened but somehow you realize how it ends, I liked the opened ending, but I still would like to request a 2nd season ***(BIG SPOILER)*** (specially because they still didn't catch Lee Jun Yeong, and we don't really know which was the decision of Min). ***(END BIG AND NOT BIG SPOILER)***