The review does NOT reveal who is the perpetrator.

Yes, I just like Jung Yoo Mi as the female prosecutor!

This is a decent police and detective drama, not worse than American ones, on the contrary introducing a strong respect for every death and for every human body. Corps are not unnamed objects of the study, but they are worthy of respect human remains. I am grateful to authors for that.

The advantage of drama is that each character is a little bit incompetent and lacking.
Prosecutor Eun Sol, she is sometimes unprofessional and makes mistakes, but at the same time she doesn't sympathize with murderers or fear them. It was a great pleasure to watch Jung Yoo Mir in this role.
Forensic doctor Baek Beom, played by Jung Jae Young - Why does everyone hate him? I think he breaks the rules of Korean social etiquette and has no social competence. He is rude and he is cool.
Detective Cha Soo Ho: Lee Yi Kyung goes on the wave of his previous performance in "Eulachacha Waikiki" and he is funny here, especially when he tries to flirt with beautiful Stella, but also shows his honest, dramatic acting, and he is good.
Other characters are well-written as well. The first prosecutor, played by Park Eun Seok, is stubborn and blind to the truth, the other one, played by Oh Man Seok is mysterious and intelligent. Both of them have their proper place in drama.

Story line is a bit disappointing, because personal experiences and tragedy of the forensic doctor Baek Beom don't add anything to the investigation. It's a rule in kdrama to give a lot of flashbacks, but here it doesn't seem to be working.

Rewatch is problematic because if you know who the murderer is, the secret is destroyed!

Drama is entertaining, because the viewer follows the detectives and wonders if they can catch the killer, but also it shows the truth about death, does not use euphemisms and does not offend the viewer's intelligence.