The standard way of saying 'Hello' in Korean is Annyeonghaseyo pronounced as ahn-yong-hah-say-yoh. You can use this phrase to people you would like to show some respect. Annyeonghaseyo means "please be well" or "please be peaceful." While Annyeong is the informal way of saying 'hi' or 'hey'. Make sure to use this with your friends and relatives who are younger than you.