Annyong haseyo: Hello. Pronounced ahn-young ha-say-yo.
Annyonghi kyesayo: Goodbye (said to a person staying). Pronounced ahn-young-hee-kay-say-yo.
Annyonghi kasayo: Goodbye (said to a person who is leaving). Pronouncedahn-young hee-ka-say-yo.
Pangapsumnida!: Pleased to meet you! (Usually stated when shaking hands.) Pronounced pan-gup-sum-mee-da.
….olmayo?: How much is this….? (useful in markets). Pronounced ol-may-yay-yo.
…chuseyo: Please give me …. Pronounced chew-say-yo.
Yogiyo!: Over here! (used to hail a server in restaurants). Pronounced ya-gee-yo.
Ajoshi: Sir (used when addressing a man whose name you do not know). Pronounced a-zo-see.
Ajummah: Ma’am (used when addressing a woman whose name you do not know). Pronounced a-zoo-ma.
Agashi: Miss (used when addressing a girl/unmarried woman whose name you do not know). Pronounced a-ga-see.
Hakseng: Student (used when addressing a teen whose name you do not know). Pronounced hak-sing.
Kamsahamnida: Thank you. Pronounced cum-sa hum-needa.
Mianhamnida: I am sorry. (For example, after bumping into someone in a crowded elevator or subway car.) Pronounced mee-an hum-needa.
Yeongeorul malsum halsu isseoyo?: Do you speak English? Pronounced young-o-rool mal-sum hall-soo a-say-yo.
…..ae ka-chuseyo. Please go to… (Use to direct taxi drivers.) Pronounced (place name) ay ka-ju-say-yo.
Source: http://travel.nationalgeographic.com/travel/city-guides/seoul-cultural-tips/