This is the 17245th most frequent Korean word.
서울출입국
"Seoul Immigration Office."
In this sentence, '서울출입국' refers directly to the Seoul Immigration Office as a location visited by people.
서울출입국에는 다양한 국적을 가진 사람들이 방문합니다.
People of various nationalities visit the Seoul Immigration Office.
Here, '서울출입국' is used to denote the place where actions related to document submission occur.
저는 서울출입국에 서류를 제출하러 갔어요.
I went to the Seoul Immigration Office to submit documents.
In this example, '서울출입국' is referenced as the authority responsible for visa processing.