Long time no see. ( polite )
오랜만이에요.
Oraenmani eoyo

Long time no see. ( casual )
오랜만이야.
Oraenmaniya

Goodbye. ( to the one staying ) ( polite )
안녕히 계세요.
Annyeonghi gyeosaeyo.

Goodbye. ( to the one leaving ) ( polite )
안녕히 가세요.
Annyeonghi gasaeyo.

Goodbye. ( to the one staying) ( casual )
잘있어
Jalisseo

Goodbye. ( to the one leaving ) ( casual )
잘가
Jalga

Bye. ( casual )
안녕
Annyeong

Nice to meet you. (I'm meeting you for the first time) ( most polite )
처음 뵙겠슴니디.
Choeum boibgeoisseum nida.

Nice to meet you. ( most polite )
만나서 반갑슴니다.
Mannaseo bangapseumnida.

Nice to meet you. ( polite )
반가워요.
Bangawoeyo.

Nice to meet you. ( casual )
반가워
Bangawoe

Thank you. ( most polite )
감사합니다.
Kamsahabnida.

Thank you. ( most polite )
고맙슴니다.
Gomapsemnida

Thank you. ( polite )
고마워요.
Gomawoyo.

Thank you. ( casual )
고마워.
Gomawo.

I'm sorry. ( most polite )
죄송합니다.
Juisonghabnida.

I'm sorry. ( polite )
죄송해요.
Joisonghaeyo.

I'm sorry. ( casual )
미안해.
Mianhae.

Yes. ( polite )
네
Nae

Yes. ( casual )
응
Eng

No. ( polite )
아니요.
Aniyo.

No. ( casual )
아니.
Ani

I'm okay. ( polite )
괜찮아요.
Gaenchanayo.

I'm okay. ( casual )
괜차나.
Geanchana.

To drink - 마시다 masida

To eat - 막다 meokda

Food - 음식 eumsik

Restaurant - 음식점 eumsikjeom

This is delicious - 이거 맛있어요 ikoe masisseoyo

Hot (temperature) - 뜨겁다 ddeukubdda

Cold - 차갑다 chakabdda

Delicious - 맛있다 masidda

Taste - 맛 mas

Sweet - 달다 dalda

Salty - 짜다

Sour - 사다 sida

Hot (spicy) - 맵다 mebda