[South Korea] - the Hwaseong Serial Murders.

[UltimaOnline]

https://en.wikipedia.org/wiki/Memories_of_Murder#Real_life_case

 

[Scrooball (clone)]

Watched this documentary. Top notch stuff from CNA.

 

[UltimaOnline]

Watched this documentary. Top notch stuff from CNA.

The Korean movie "Memories of Murder" based on the real-life HwaSeong serial murders is the #1 top ranked Korean thriller movie on many ranking lists, including this YouTuber :