Well, this is one way to avoid actually having to teach anything.
The Korean Teachers' and Workers Union certainly is on the ball, and has made no effort to hide its agenda. Because the link has hangeul in it I don't seem to be able to embed it, so just copy-and-paste this into your browser: http://news.eduhope.net/news/view.php?board=교육희망-photo&id=282. Anyway, it looks like this class from "ㄱ" Middle School is keeping busy. Not as busy as the students from this Incheon Middle School who made flagrantly anti-Japanese posters at the behest of their teachers, and then displayed them at subway stations around Seoul and Gyeonggi (pictures here and here).
You can browse the union's webpage here and their newspaper here, and they're both good resources whether you're starting your own blog or looking for decorations for your classroom.