It takes me a while to watch this drama because of the negative reviews but I gave it a try and I enjoyed it. Actually it take me 3days to finished the whole series and made me guessing the whole time. It was not that perfect but it exceed my expectations. My investigative mind really works in this drama. The twist of the story was done perfectly and unexpectedly actually. The cast did will plus the editing and directing is thumbs up....OCN never fails me, when it comes to this genre they are the best.