@givemersspls
Not even teachers can solve everything. Okay... So what? Does that mean that teacher's can't solve this specifically? Does that mean that you shouldn't even try telling the teacher? Does that mean that it could in any way be bad?
Have you ever seen anything like this go down in real life? Often, reporting bullying or a theft to school authorities merely doubles down on the problem (as it very realistically ended up doing in this case), because now the bully or thief isn't just doing whatever they were doing out of spite, they'll be angry at the victim because they'll automatically assume the victim was the one who reported them. And, well, "snitches get stitches". Everybody knows this, and that's why virtually the only time school discipline is effective is when a staff member directly witnessed the incident, so the perpetrators can't blame anyone else for telling on them.
"Tattletale" is one of the worst labels you can get branded with as far down as kindergarten and elementary school in my country, and often results in social ostracization even by kids who aren't involved in the incident at all, once word gets around. ("Keep your head down and don't make a fuss" also seems to be an even stronger general cultural idea in Korean, Japanese, and Chinese cultures than it is in mine.)
You see the same effect in most organizations. Sure, you might have a reason to file a corporate HR complaint or a whistleblower report on something bad happening, but if
anyone finds out it was you, you'll be shunned by all the other people who were turning a blind eye to this behavior beforehand, and will possibly even face retaliation. This isn't rocket science, it's just how things work, and most people realize that instinctively at a fairly early age.
The teacher was trying to make an example out of him and the class president, Jo Yeon says yeah, there's theft in my class, and he even apparently gives the teacher an opportunity to say something. The teacher says nothing, and then they walk away. That's what I find pretty bad. That one makes no sense, that the teacher didn't press the issue at all.
It makes perfect sense. That teacher only wanted to use Jo Yeon and the class pres (who's a badass in this chapter) to make a point during a chewing-out he was giving two of his own students who'd been caught stealing. He didn't actually care about Jo Yeon's situation - it's another class and so it's not his problem. (This ties back into the whole "teachers who have burned out and are only in it for themselves" concept that was discussed during the Ethics teacher's arc. Remember, this is the teacher who told Hot Bun's homeroom teacher that all the students looked the same to him.)
At least Jo Yeon's teacher actually tried to figure out who the victim was.