I remember watching the teaser trailer of this drama and thinking it was going to be amazing so I went into it with high hopes.
Unfortunately I have to say that it didn't meet my expectations and it was quite average. I was actually quite shocked to see the amount of praise it got because although it wasn't a horrible drama, it definitely was average at best.
The concept was interesting however the actual plot failed to engage me. It was one of those dramas that I just forced myself to watch just so I could complete it.
Overall it's not a bad drama but if you like crime/thriller dramas there are many out there that are better then this one such as 'Voice', 'Stranger', or even a more recent one like 'Flower of Evil'.