From the get go, it captured my attention. Every episode was a thrilling ride. The acting was some of the best I have seen. This is by far my favourite Asian drama. The police were actually doing their job, unlike K-dramas where they are utterly useless. Here, they caught on to even the slightest of suspiciousness. The emotions that some of the characters evoked gave me goosebumps. The main lead duo was excellent. It all felt very real even though I was watching in front of the screen. The ending is satisfying and thank goodness it wasn't open ended. We got to see the backstory of the relevant characters. This drama has a great rewatch value in that you will start to see some of the clues in the earlier episodes. I recommend this show to anyone who is willing to watch with English Subtitles because it is a masterpiece. All the episodes are available on Youtube. Give it a watch, I will guarantee you it will be amongst your favourites!