5월 21일자 해커스 어플 일일 문제인데요

Few have registered to join the field trip, so we have decided to cancel the event and refund those who have already paid.

라는 문장이 있어요. 제가 궁금한 부분은 마지막 문장에 refund those 부분에서 those 를 돈으로 해석 해야 하나요? 아니면 사람들로 해석 해야 하나요?

Who가 쓰인 걸로 보면 사람인듯 하긴 한데 형식에 맞춘 해석이 어려워서요 ㅠ
근데 who 이하를 보면 돈으로 해석 되는 건가 싶기도 하구요 ㅠ
영알못이 질문합니다 ㅠ