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Explanation: You can use "An Nyeong Ha Se Yo" to anybody and anytime in Korean. Not like English, there is no specific greetings for certain timing in Korean. "An Nyeong Ha Se Yo" means "Is everything all right? It came from Korean history. Koreans went through many attacks from neighbours in old days and people checked each other see if they are all right. I guess Koreans still do.