만 해주고

just do … for me and

→ 만
phrase Rare #17,107
just do … for me and 만 means “only” or “just,” and 해주다 means to do something for someone. The ending 고 connects this action to what follows.
KO: 이것만 해주고 나머지는 제가 할게요.
EN: Just do this for me, and I’ll do the rest.