잘 가 – go in peace
안녕히 계세요 (annyeonghi gyeseyo) – This is a formal way of saying goodbye in Korean. It is used when you are leaving someone who is staying in the same place. It literally means “stay in peace”. 안녕히 가세요 (annyeonghi gaseyo) – This is a polite way of saying goodbye, and is used when the person …