I dropped the series because of how ridiculous it was getting. Also I couldn't bear the mental abuse the FL had to go through because of the law enforcement officers. FLs request to include her sister got denied by investigator but when proven right, the investigator decides to rub it on FLs face that the FL is to blame.
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The plot isn't overly complicated.
A serial killer and a serial train thief is on the prowl and our passionate FL is determined to go above and beyond her orders in order to apprehend the criminal.

While labeled as fiction the neglect, limitations and lack of empathy from the police officers and their drive for results based on what they think is right in order to meet their qouta and obtain for themselves and their superiors the glory of "solving or closing" the case is definitely spot on. It cannot be denied that this happens in real life as well.

With this fact in mind you will be less frustrated watching the police officers and their bureaucratic red tape in this series.

I enjoyed this because of the different types of cases they got to handle. It's disgusting how the showrunners tried really hard to push the romance envelope between the leads and it was so cringe, uncomfortable and unnecessary - they should have just focused only on the investigation side and removed the romance element.

ML and FL did not look good together. I have to say MGY has not aged well and the way she smirked the whole time made it worse. Her acting is still top of the line of course but I think she should just stick to non romantic roles.