I have watched a lot of those type of documentary-style stories and this one is a very good one. How they lead the story is made really good and intersting.

How was Korea economically doing at that time and how has it effected the society?
They use the society's and economic's situation to lead the story and to tell the very story of Yoo Young Chul.

To hear from all the people involved in this case, such as police officers, profilers, laywers, and indirect victims was very interesting and also suspenseful and sad. You can see and feel their emotions when they were talking about it.
The interviews, reenactments and real footages are well portioned. What I also like was how they addressed the impact, that this whole case has on the society, the national police system, for example. And the title is also well chosen.