된단

that ... is or becomes; that ... has to

→ 되다
verb · informal Rare #30,562
that ... is or becomes; that ... has to A conversational contraction of 된다는, used before a noun such as 말, 것, or 뜻.
KO: 오늘 일찍 가야 된단 뜻이야.
EN: It means we have to leave early today.
Conjugation of 되다

왜 안 된단 거 죠?

Why doesn't it work?

— 바람계곡의 나우시카 (1984)

내일 내 아내가 이 차 써야 된단 말 이야

My wife needs to use this car tomorrow, you know.

— 아노라 (2024)