One of the best procedural drama in a long time. Good focus and storyline on the cases with minimal "drama", so much so that the crime dramas that I watched after that did irritate me with all the crazy coincidences and dramatic plot that I had to remind myself that they cannot be compared to what we have in Through the Darkness, which is so real in its depiction of evil in the serial killers they portray.

Ep 7 will air on February 25th 2022 due to the Olympics

This drama delivers exactly what it promises in the summary and does it very well. It's not mind-blowing, but it's a huge relief that the show doesn't try to bite off more than it can chew. The plot progression is straightforward, the pacing/suspense is on point, the MCs are very good, the secondary characters put up a good showing as well. If you don't mind the amount of time the shows spends on pretty heavy/depressing talks with criminals, it's an easy recommendation in procedural shows.

I liked the vibe of the show… the actors are so good wow Creepy in it was a crime drama yk yk No dramatic plot twist which was good

9/12 Song Ha-young was actually a good main character until they try to show him losing his sanity 12/12 Kim Nam-gil and Jin Sun-kyu delivered great performances!! i love how it shows and respected the family victims