하면 넌

if you …, you

→ 하다
phrase Rare #24,918
if you …, you 하면 introduces a condition, and 넌 means “you” as the topic. 넌 is an informal contraction of 너는.
KO: 그렇게 하면 넌 후회할 거야.
EN: If you do that, you'll regret it.

네가 이해 못 하면 넌 기생충 같은 놈이 되는 거 야

If you can't understand, you're nothing but a parasite.

— 얼굴 (2025)