When doing business in South Korea men greet each other with a slight bow sometimes accompanied with a handshake. When handshaking, the right forearm is often propped up by the left hand. Maintaining eye contact is good etiquette. In South Korean business culture, women also shake hands. Western women doing business there will need to instigate a handshake with Korean men, as out of politeness, a hand will not be forthcoming.
Address people by their title or by their title and family name. First names can be used once a relationship has been established but wait for your Korean counterpart to initiate this change.