Why Koreans refuse to work in factories

I guess factory work is something that causes heavy metals to build up in your body.
But to avoid getting caught, they tricked people by claiming they were administering vitamin injections when they were actually giving other types of injections.
They repeatedly administered injections to people while lying about the contents, which could have caused side effects.
What's even more ridiculous is that the fine for this was only 46.2 million KRW.