In Korea, no matter how hungry you are, you can’t start eating before the oldest person at the table does. If you violate this rule, you might not be invited back to eat at someone’s home. And one more thing: if you want to get yourself a drink, you will need to ask a person sitting right next to you. Koreans fill each other’s glasses.
Thai people are almost always smiling, which demonstrates their positive mindset. However, there is an ordinary thing that most people do that can ruin a Thai person’s mood in an instant. In Thailand, you can’t touch anyone’s head. And it’s not about the hair. It’s just that Thai people believe that the head is where the soul is.