in korean, '안녕하세요' is 'Hi' or 'Hello' as you know, you can say it when you meet someone. and it's more polite than just saying '안녕'. you know? '안녕' means 'Hi' and 'bye'. it depends on when to say, the situation. it's informal but sounds familiar. so you can say '안녕' both ways

I think its correct And it means hi not bye @@