Watching it from a perspective of this drama being about seria killers, I think it did a great a job about showing that. Criminals in the drama were interesting, had a traumatic backstory that could "explain" how they ended up as serial killers, and it even explained some concepts about criminal psychology. So speaking about "criminal minds," I think it's a good drama.

However, i felt that it focused too much on that, that the rest was not important. I would've wanted for this drama to show more backstory about characters and even more random dialogue among them. It was always too focused on solving crimes that there was no room for humor or everyday talk.

Also, the episodes felt that they were cut short abruptly just to end them. It's a good kdrama, but don't expect to watch more other than psychopaths and their crimes.