I love Seo In Guk since Reply 1997 so this drama immediately caught my eye. The first episode was quite dark and capable of drawing me into full curiousity. After I finished it, I kept staring at my computer, still stunned by the ending and one thing crossed my mind.... it's not that satisfying. The story was good, good enough it deserves 10, but I can't burn my dislike with Jang Nara's role here. It doesn't suit her and for me, I don't feel any chemistry between her and Seo In Guk. That too, and not enough character development which made the romance seems dull. In exchange, the writer manage to draw the most complex and sweetest Bromance of the year. Park Bo Gum is one of few reasons for me to continue this drama. I know he's on the dark side but I can't help to feel sorry and rooting for him not to get caught. I recommend this to anyone who like thriller and mystery. You'll get hooked and become Park Bo Gum's fan ;)