않는다면요

if ... not; if ... doesn't

→ 않다
않 not (forms a negation after -지) + 는다면 If (someone) does + 요 Polite speech
auxiliary · formal Rare #30,855
if ... not; if ... doesn't A polite conversational form used to raise a hypothetical, often like “what if …?” It attaches to a verb ending in 지.
KO: 비가 오지 않는다면요?
EN: What if it doesn’t rain?
Conjugation of 않다

만약 머프가 시계를 찾으러 오지 않는다면요?

What if Murph doesn't come to get the watch?

— 인터스텔라 (2014)

규정을 따르지 않는다면요?

What if I don't follow the rules?

— 영원 (2025)

가능성이 보이지 않는다면요?

What if there's no possibility?

— 인터스텔라 (2014)