관리자가 · 관리자를
manager, administrator, supervisor
Example
건물에 문제가 있으면 관리자에게 연락하세요.
If there's a problem with the building, contact the manager.
Word parts
관 control+리 order+자 person
Literally 'person who controls and keeps order'.
Good to know
Pronounced [괄리자] — ㄴ becomes ㄹ next to ㄹ.