In the film, a prosecutor curses that South Korea is a shit country and it is so difficult to raise a child safely. I've always heard that Korean War movies are particularly good. Many parents are a country with a wooden stick, and there is nothing special except that everyone can shoot soap operas such as smelly socks with masks.
If the law can't uphold justice, protect the victims and let the perpetrators get the punishment they deserve, it will only lead to the tragic ending of fighting violence with violence. Fighting violence with violence is irrational, but it also expresses deep disappointment with the law from one side. The performance of the injurer without remorse is the last straw to break the camel's back.