I am southeast asian (philippines) and yea it is true. Taking money and lunches from students who are alone and is ignored. "sometimes" the teachers(here in my school) try to atleast reach out to the bullied ones (IF THEY DO NOTICE THEY ARE GETTING BULLIED) but most of the time they don't care caz it's a big school.
I was one of the bullied HAHA but I learned to fight back but I still get bullied every now and then.
The bullying is not that violent than what you read on the manhwas, they just push you at most and talk behind your backs. (︶︿︶)=凸
And I think in korea, the schools are much larger than here in the Philippines. So it is much more harder to maintain the students and keep watching over them. And yea bullying IS a thing and taking money IS too.
If you have any more questions y'can ask me.

I started to re-read it and ahh im so annoyed at his school bully again. Can someone who grew up in asia tell me whether its real that people take money from others in school? I'd prefer to be beaten up than to be slave to someone (like buying them food) or giving away my money to them... (however i know that bullying in korea is more harder, so i may not be able to imagine how hard is for victims there).