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에 있을 거야

will be at/in

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phrase Uncommon #14,800
will be at/in Used after a place to say someone or something will be there. This is a casual form.
KO: 내일은 집에 있을 거야.
EN: I’ll be at home tomorrow.

힘멜 앤 홀에 있을 거 야

It’ll be in Himmel Hall.

— 존 윅 4 (2023)

우린 바로 여기에 있을 거 야.

We'll be right here.

며칠 더 보스턴에 있을 거 야?

Are you going to be in Boston a few more days?