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That's pretty interesting. I don't know anything about Japan really, but having lived in Korea, I can say with certainty that Koreans wear masks when they are sick to prevent spreading it to other people and not for decorative purpose. If you have even the slightest sniffle or cough and don't wear one, people are going to think negatively of you. I've never seen someone pull their mask down to cough or sneeze.

A more recent development is decorative designs, and that's been popularized a bit by kpop stars in music videos, but no one wears a mask in Korea in real life just for decoration. The only time outside that is when yellow sand is bad.

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