People traveling to different cultures are cultural ambassadors for their own countries. It is important for you to be sensitive to the local culture of the place you are visiting to be able to show respect for their hospitality. Adhering to local etiquette also allows you to have an enriching and deep cultural experience. Here are some pointers to keep in mind while in Korea:

Greeting

It is important to greet and acknowledge a Korean. The Koreans usually greet each other by a bow of their heads with the depth of the bow based on the seniority of the two people. Koreans also do not appreciate physical contact beyond handshakes between aquaintances.

Interaction and Conversations

Koreans are not flamboyant or loud people, therefore, they do not appreciate an overly outspoken style of conversation. When in a group, they also do not appreciate fractional conversations and like to be respectful of everyone by including them in any discussion

Entering a Korean Home

When entering a Korean's house it is customary to remove one's shoes. However, bare feet are considered offensive, therefore it is important to wear socks (in both summer and winter).

Eating Out and Sharing a Meal

If you are planning on going out for a meal with a Korean, then you must remember that Koreans do not split the bill. Depending on the situation (seniority and invitation), you will either be a guest or the host.

Tipping
Tipping is not customary in Korea. Sometimes, expensive restaurants and luxury hotels may add a service charge of 10%. Thus, you do not necessarily have to prepare for extra charges since it will be included in the bill.

Handy Korean Expressions

http://english.tour2korea.com/02Culture/KoreanLanguage/handy_korean_phrases01.asp?kosm=m2_9&konum=subm2_1