The character of Eun-sol is in turn likeable and incredibly infuriating, for the first few episodes, but as she gains both experience and confidence, her over eagerness and assumptions that she must be right, lessen greatly.
Baek-beom's nickname of Grumpy Beom is an understatement and it's hard to believe anyone could get away with some of the stuff he does. Again though, as the story progresses and we learn more about his past, which is gradually uncovered for him too, he begins to very slowly come out of himself.
The forensic post mortems are quite graphic, even though blurred out, and there are some quite gross scenes. The crimes include abuse and rape, so could be a trigger for some (hence the "18' rating I imagine).
Surrounding characters are varied. Some deep, others arrogant and also a wonderfully light hearted police officer, Cha Soo-ho. A couple, though, are incredibly annoying, one from being so thick and negative (if he applied himself half as much to caring about his work as he does to eating, he'd be better than everyone at the lab), to another constanty speaking in English, which I found ridiculous.
The crimes and criminals overlap, lacing together to form a pretty good and intricate plot. Things are not always as they seem and there are some surprises.
The strange working relationship that forms between Eun-sol and Baek-beom is very amusing at times and it's her tenacity and quite thick skin that seem to appeal to him.
There is a lot of shouting and screaming at times (too much on occasion), but also some moving and distressing story lines.
Series 1 leaves us at a bit of a cliff hanger and I'm invested enough to head straight for series 2....