For what it's worth. What I'm saying was years ago, maybe something has changed maybe it hasn't. Koreans aren't real big on shaking hands they bow to each other, if they are dealing with an American who they think knows nothing about their culture naturally they will shake hands. If the Korean bows to you, you in turn bow lower than they did, it's a show of respect, don't offer your hand unless they do first, especially if they are older. Don't associate anything Japanese with them as calling them mommasan or poppasan. The older Koreans have no love for the Japanese. They controlled their country twice, last time between 1910-1945. Another tidbit is their number 4 is the same as our 13, often their advertisements in magazines or billboards are written in Chinese, if they are counting something unimportant they will use Korean numbers, if it's important like money its in Chinese.
