I believe the previous comment was about visa-holding, language teachers, such as a foreign teacher in a Hakwons.
10-15 years ago midnight runs were more prevalent because you could wait out the expiration of your visa and come back to work for for another company.
The handful of people that I knew who did this had their salaries underpaid or paid late. Sometimes they did it because the company refused to give them the correct benefits or working conditions. The treatment of foreign teachers is so bad that even current government contracts will have clauses that break the Korean labor standards.
The article is talking about actual licensed Korean public school teachers. They have a higher retention rate. But, as the article points out, they do suffer from abusive parents (and sometimes students) and a lack of support from their schools and the government for dealing with them.
Don't know where to post this, but one image interaction I would LOVE to see is being able to open an image with a single tap. Right now, I tap the image, and the post&comments open, then I have to tap it again to get the image to fully open.
I know everything is new, but i think it'll help the folks that are here just to browse the memes.