Go get some linen shirts and light pants or shorts for summer, get an umbrella during rainy season, soju ju-say-yo (소주 주세요) will be your favorite phrase. If you see cheap glass bottles of water at the CU (gas station type store) it is soju (Korean alcohol) not water, emart is like Walmart, most of the country has great public transportation. Go to Jeju but while there visit U-do island by boat, it is great.