About 앞에, 옆에, 위에, 밑에, 뒤에
에 is only used with the status of a person or object. When expressing actions and behaviors which are actively happening, use 에서
친구를 어디에서 만날 거예요?
Where are you going to meet (your) friends?
은행 앞에서 만날 거예요.
I am going to meet (them) in front of the bank
Sample sentences
소파 위에서 자고 있어요
I am sleeping on the sofa.
나무 밑에서 책을 읽고 있어요
I am reading a book under the tree.
문 앞에서 통화하고 있었어요
I was talking on the phone in front of the door.