After listening to this lesson, you can say “Good-bye” or “See you” in Korean. In polite/formal Korean, there are two basic ways to say Good-bye.
One is when you are the one who is leaving. And the other is when you are the one who is staying.
If you are leaving, and the other person is (or the other people are) staying, you can say:
안녕히 계세요. [an-nyeong-hi gye-se-yo]
If you are staying, an the other person is (or the other people are) leaving, you can say:
안녕히 가세요. [an-nyeong-hi ga-se-yo]