되는 건데

would be; becomes

→ 되다
phrase Rare #32,050
would be; becomes Used to explain or emphasize what something would become or what would happen to it; the exact meaning depends on context.
KO: 그럼 내 책임은 어떻게 되는 건데?
EN: Then what happens to my responsibility?

그거 잘못하면 뇌물 되는 건데,

If you handle that wrong, it could be considered a bribe.

— Night in Paradise (2020)