You will get hooked from the start as this is a followup of the major incident 5 years ago. The pacing seems a bit hastened but the you won't lose any interest as the plot is littered with reveals which you don't expect.It is on par with Signal. The lead is perfect the supporting cast does a really good job. The antagonist doesn't seem upto mark with buildup he has but he manages.
The setting is somber, dark, sometimes really dark and is really good, it does a good job of hooking you up , you won't mind some cliches which pop up in middle. The chemistry is OK but you won't be looking at that between the lead. The lead actor steal every scene he is in and he never disappoints some of the other members may.What I am surprised is why this show has not gained enough traction as some others have. I saw two episodes of The VOICE and I stopped watching it because of the screenplay but this series has doesn't suffer that.
You won't regret watching this series because you won't feel the time pass.Most of the episodes cross the 1 hr mark but are still worth it. There is some minor hiccup in the middle but you won't mind as it passes. This is the best thriller series from Korea that I have watched.