#4: Korean women cover their mouth when laughing 

You’re probably going to see Korean women covering their mouth with a hand while they’re laughing out loud. This gesture apparently has a historical reason. Girls and women back in the past were taught that laughing is not very feminine. So, they would either turn away or cover their mouths when laughing. Today it’s still seen as a sign of modesty, politeness, and lady-like behavior. So, when you see someone cover their mouth when laughing, you know it’s not because they try to hide bad breath or because they’re afraid of having something stuck in between their teeth.