This a show for a more mature audience, who enjoy a more realistic take on police cases as the cases might take a really long time to solve and the arrest isn't always directly made my the lead characters. The suspense in this show comes from exploring the human mind of murderers and the experiences the ML goes through due to digging into these monsters' minds, not gore or jump-scares.

I liked that this show wasn't predictable and cliche like most dramas, the plot overall didn't move in a predictable way like usual, sometimes things might drag on for a long time and seem to build up to a cliched stand-off but unexpectedly, come to an end quickly before that. This seemed really realistic for me, as in real life, things rarely build up suspense layer by layer and come to a dramatic end, sometimes things that last long might come to a very quick and easy end at surprising times.

The time-skips were done very naturally and gave time for the characters and cases to develop in a natural way.

For people like me, who have watched plenty of shows about profiles before, some of the things they pointed about the criminals' psychology might've seemed obvious when they explained them to other police , but it fit very well for the time period the show was based on - profiling was completely new to Korea back then.

The acting was fantastic, both by the main leads and the criminals. For a plot that could've easily seemed boring and flat for many people for the lack of the usual dramatics shown in police shows, the subtle intensity (even for really reserved characters like the ML and FL) in which the actors delivered their lines and scenes kept the show captivating and let the great plot shine.