될 거 아니야

you could just, should ...; have to ...

→ 되다
phrase Uncommon #11,270
you could just Often used in a rhetorical question to suggest that something is an obvious or simple solution.
KO: 여기서 기다리면 될 거 아니야?
EN: You could just wait here, couldn't you?

형 집에서 나와서 따로 살아 따로 살면 될 거 아니야?

Why don’t you move out of your older brother’s place and live on your own? Then you can live separately, can’t you?

— Virgin Stripped Bare by Her Bachelors (2000)

돈부터 받아야 될 거 아니야

Shouldn’t you get paid first?

— Space Sweepers (2021)

phrase Rare #16,820
should ...; have to ... Used rhetorically to stress that something should or has to be done, often while expecting agreement.
KO: 이제 가야 될 거 아니야.
EN: We have to leave now, don't we?

야, 강해상 잡아야 될 거 아니야!

Hey, we need to catch Kang Hae-sang!

— The Roundup (2022)

확실하게 해야 될 거 아니야

You need to make sure, don't you?

— Space Sweepers (2021)

나도 좀 살아야 될 거 아니야?

I have to live a little too, don't I?

— The Chaser (2008)