The best part of this drama is hands down the antagonist, who is just the most intriguing kind of serial killer. We get a backstory showing her how she got to that point and what she's feeling (or what she's not), and I really loved the layer of moral grayness in her reasoning behind the killings. It really made me question the blurry line between right and wrong and think about who has the power or right to decide who deserves to die and who to live.

All this, paired with the eccentricity of the female lead who has her own blurry backstory, made for a really interesting dynamic between the two not only when they were playing their game of cat and mouse, but also during their very intense confrontations.

I thought the side characters on the team were also great and had their personalities and roles, each with a different worldview that meshed well together.

As the plot progressed, it started to incorporate other antagonists and manipulators that were related to politics or familial secrets; while I'm not necessarily surprised because I knew the story had to get bigger than a single killer and her accomplice, but I just felt like the additions started to get messy and I was not at all as interested in these other people with other motivations. It just felt too common and it seemed to stifle the potential of the main antagonist.

Though there were some parts that felt a little rushed — especially in light of all the new antagonists and characters that were added that I mentioned above, I still felt like the drama wrapped up the storylines nicely.

Throughout the entire show, the OST was great and it definitely made me feel the intensity in every scene.