South Korea has been in hot water for decades for consuming dog meat. Increasingly, South Koreans, especially the young, are turning away from the practice. Here's the context you should know if you want to criticize.
In the DMZ, dubbed by some as the most heavily fortified border on earth, it's not only bullets and mines. For decades, loudspeakers have been at the center of psychological warfare between South and North Korea.
THAAD is a pretty useful acronym to know if you're interested in geopolitical tensions in East Asia, especially about North Korea. Why does China hate it?