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망치면

if (someone) ruins, if (someone) messes up

→ 망치다
verb · informal Rare #29,831
if (someone) ruins, if (someone) messes up The ending -면 means “if” and attaches to the verb.
KO: 계획을 망치면 모두가 곤란해져요.
EN: If you ruin the plan, everyone will be in trouble.
Conjugation of 망치다
Conditional
망치면

내 머리 망치면 안 돼!

Don't mess up my hair!

— 증오 (1995)

경고하는데 이 일 망치면 넌 끝 이야!

I'm warning you, if you mess this up, you're finished!

— 아노라 (2024)