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해 주면

if (someone) does it for someone

→ 하다
phrase Uncommon #14,592
if (someone) does it for someone 주다 adds the sense that an action is done for someone; the person benefiting is often understood from context.
KO: 한 번 더 설명해 주면 이해할 수 있어요.
EN: If you explain it one more time, I can understand.

다음 주 면 괜찮을 거 같은데 수안이가 이해 좀 해 주면 안 될까?

I think next week would work. Could Suan be a little understanding?

— 부산행 (2016)