있어야 할

that should be

→ 있다
phrase Rare #30,035
that should be Describes something that is expected or necessary to be present or in a particular place.
KO: 여기에 있어야 할 책이 없어.
EN: The book that should be here is missing.

이제 누군가 있어야 할 나이 잖아

You're at the age where you should have someone by now.

— 델리카트슨 사람들 (1991)

나가면 돈이 있어야 할 텐데

I'd need some money if I went out, though.

— Oldboy (2003)