에 계신

who is/are at

→ 에
phrase Rare #31,052
who is/are at Used before a noun for someone who is at a place; 계신 is the honorific form of “being.”
KO: 도서관에 계신 선생님을 만나러 왔어요.
EN: I came to see the teacher who is at the library.

내일 니시노미야에 계신 고모를 뵈러 가는 거 야

I'm going to Nishinomiya tomorrow to visit my aunt.

— 반딧불의 묘 (1988)

“텐트에 계신 분들, 안녕하세요!”

Hello, everyone in the tent!

양로원에 계신 몸이 불편한 할머니들은 어떡하고요?

What about the elderly people in nursing homes who are not feeling well?

— 벼랑 위의 포뇨 (2008)

우주선에 계신 분들, 반갑습니다!

Hello to everyone aboard the spaceship!