Phrases
Annyeonghaseyo (안녕하세요): hello
Gamsahamnida (감사합니다): thank you
Eolmayeyo? (얼마예요?): how much?
Igeo juseyo (이거 주세요): this one, please
An maepge haejuseyo (안 맵게 해주세요): not spicy, please
Kadeu dwaeyo? (카드 돼요?): can I pay by card?
Hwajangsil eodiyeyo? (화장실 어디예요?): where's the restroom?
Etiquette
Give and receive things, especially money and cards, with both hands or your right hand supported by your left.
Let elders start eating first, and pour drinks for others, not yourself.
Keep your voice down on the subway and in residential areas like Bukchon and Ihwa.
Don't stick chopsticks upright in rice, and don't write people's names in red ink.
Take your shoes off where you see a raised floor or a shoe rack.