감사원이 · 감사원을
Board of Audit and Inspection (Korea's national audit agency)
Example
감사원은 정부 기관의 예산 사용을 감사합니다.
The Board of Audit and Inspection audits how government agencies use their budgets.
Word parts
감 oversee+사 inspect+원 institution
Literally 'institution that oversees and inspects'.
Good to know
Don't confuse this 감사 (audit) with 감사 (thanks); context makes it clear.
Related words