The plot is filled with a lot of murders, which eventually became very very frustrating. In general, nothing interesting happens in the series. The plot seemed to be moving forward, just not in the direction I might have wanted it to go. Villains were slaughtering everyone who decided to show in their path, which made me feel resentful and angry, because I often wondered - when will it all end? The reasons why the cult operates were not explained, or explained very briefly. Basically, it was presented as a senseless slaughter of people for the sake of some so-called messiah, liberation, etc. Absolute nonsense, in my opinion. That constantly screaming boss was almost maddening, lieutenant Yu lacked facial expressions or any of the qualities that are necessary for a profiler. Though I really liked Seungmin and doctor Minaje characters, I think these two did a really good job.
Also, the OST is completely out of place, it doesn't convey the atmosphere of the series, especially those rap songs.
It had a promising start, but eventually became a huge dissapointment.