When to use adult in Korean
Korean: 어른[ eo-reun ]

When to use it
어른 means an adult or a grown-up. It is used for people who are not children, like parents, teachers, or other grown people. In everyday Korean, people often use it when talking about rules, family, or who should help a child.
Example sentences
집에는 어른이 두 명 있어요.
There are two adults at home.
학교 운동회에 어른도 많이 왔어요.
Many adults also came to the school sports day.
길을 건널 때는 어른과 같이 가세요.
When crossing the street, go with an adult.
저분은 우리 동네의 친절한 어른이에요.
That person is a kind adult in our neighborhood.
마트에는 아이보다 어른이 많아요.
There are more adults than children at the mart.
여행할 때는 어른과 함께 가요.
When traveling, go with an adult.