봉사정신이 · 봉사정신을
spirit of service, volunteer spirit
Example
그 간호사는 투철한 봉사정신으로 환자들을 돌봤어요.
That nurse cared for patients with a deep spirit of service.
Word parts
봉 serve+사 serve+정 spirit+신 spirit
Literally 'serving spirit'; 봉사 alone also means volunteer work.