How do you say Bye in Korean?

How do you say Bye in Korean?

Formal
안녕히 가세요  ahn nyeong hee ga sae yo
안녕히 계세요. ahn nyeong hee gyae sae yo


Informal (to your friends, family members who are same age or younger than you)
안녕 (pronounce 녕 little bit longer) ahn nye~ong