Here are some common greetings in Korean:

1. 안녕하세요 (annyeonghaseyo) – Hello/Good day (formal)
2. 안녕 (annyeong) – Hi/Bye (casual)
3. 반갑습니다 (bangapseumnida) – Nice to meet you (formal)
4. 안녕히 계세요 (annyeonghi gyeseyo) – Goodbye (to someone staying)
5. 안녕히 가세요 (annyeonghi gaseyo) – Goodbye (to someone leaving)
6. 잘 가 (jal ga) – Bye (casual)
7. 어서 오세요 (eoseo oseyo) – Welcome (formal)
8. 어서와 (eoseowa) – Welcome (casual)
9. 즐거운 하루 되세요 (jeulgeoun haru doeseyo) – Have a nice day (formal)
10. 좋은 하루 되세요 (joeun haru doeseyo) – Have a good day (formal)
11. 좋은 아침이에요 (joeun achimieyo) – Good morning (formal)
12. 잘 지내셨어요? (jal jinaesyeosseoyo?) – How have you been? (formal)
13. 뭐 하세요? (mwo haseyo?) – What are you doing? (casual)
14. 잘 지내고 있어요? (jal jinaego isseoyo?) – Are you doing well? (casual/formal)
15. 건강하세요? (geonganghaseyo?) – Are you healthy? (formal)

Hope this greetings in korean helps!