Police or letting parents know their son's a stalker weren't viable options? He's a psycho...

The mother is super wealthy and a high class business woman that can cover it up

Those options wouldn't have worked because the mother is super rich and would keep bailing the son out, plus cover up for him to keep him from getting locked up in the psychiatric ward.

I understand mom is rich, and that's an excellent point, but that was a severe crime. Byung doesn't belong in the psych ward, he belongs in jail. Also reportiing this kid's behavior to momearly on might have had some results IF she realized that the family/business reputation was at stake. I'm just thinking about the ambulance and ER crew would notice this was not exactly a self inflicted wound, and it resulted in permanent severe consequences. Thanks for the feedback and replies!

I think the Law in South Korea works differently from America? The authorities need a formal complaint first from the victim before acting. Or that they can't arrest someone (unless the crime involves a dead body anyway) when the victim didn't file a lawsuit I think. Even if it was obvious that Byung inflicted a severe injury to Yohan, if Yohan didn't choose to have Byung get arrested for his crime, then he won't.

Or maybe a lawsuit did happen but the mother negotiated with Yohan so he wouldn't go through with the case. But I doubt that. I have feeling that Yohan chose to let Byung go just so he can "finally" have peace. Or, he didn't file a case against Byung because he's friends with Gyoon and no matter what, Byung is still Gyoon's brother. Another thing to consider, Yohan was probably already convinced that everything was his fault, that he caused Byung's actions, so he decided to let Byung walk off and let his own mother deal with him instead.

I mean, anything could have happened but I'm guessing with Yohan wishing to pretend Byung never existed.

Also, Byung had already assaulted a number of people before Yohan and yet he still wasn't in jail before The Incident. And it would be unlikely that these previous victims felt sympathetic with Byung because they had no personal connections with him whatsoever unlike Yohan (i.e., he's friends with Gyoon, [thinks] he caused Byung's actions, etc.) to NOT file a complaint/case against Byung. They had all the right and freedom to do so and there should have been nothing that was stopping them from making legal actions. That's where we start to think that Byung's family's power and connection played a hand right from the beginning of his series of crimes. It doesn't matter that Byung was a psycho, as long as he's not behind bars or found in a straightjacket, Byung is not sullying the family/business reputation (according to twisted logic). Plus his family has enough power to keep people silent about his sins I think.