Korean traditional bow etiquette. Exchange information cards with each other, look carefully and close them. Don't make any noise when eating. Don't eat with a bowl. Put the bowl on the left and on the right of the soup bowl. If a friend invites you to his home, don't wear shoes in their home. It will be considered impolite to visit relatives and friends without socks. If you are invited to dinner, it would be better to bring a small gift. Besides, don't talk loudly in the subway.