you could just, should ...; have to ...
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)
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?
나도 좀 살아야 될 거 아니야?
I have to live a little too, don't I?
— The Chaser (2008)