안녕하세요
annyeonghaseyo · TOPIK 1
hello (formal)
👋 안녕 (peace, well-being) + 하세요 (are you doing?) = are you at peace?
안녕 comes from Chinese 安寧, meaning peace and well-being. 하세요 is the polite form of 하다, to do or be. So the greeting literally asks whether you are at peace, which is why it works at any time of day.