For someone staying for a longer duration its helpful understand Korean culture, and get an idea of the way of life here. These websites have done an excellent job in providing plethora of information. Take time out to refer these websites they certainly help.
Korean culture, daily life and other details an expat would find helpful
Adventure, travel in Korea
Learning Korean language
Korean grammer basics
Korean word list
Learning Korean in 15 minutes :)
Some random pictures taken in Korea