있을 것 같은데

I think ... might be

→ 있다
phrase Rare #20,642
I think ... might be Expresses a tentative impression; depending on context, 있을 can mean “exist,” “be somewhere,” or “have.” The ending can also soften a statement or invite a response.
KO: 오늘은 집에 사람이 있을 것 같은데.
EN: I think someone might be home today.

최춘백 씨 어디 있을 것 같은데 최춘백 씨!

I think Mr. Choi Chun-baek might be around here somewhere. Mr. Choi Chun-baek!

— The Roundup (2022)

그래도 핸드폰 하나 있을 것 같은데

Still, you'd think there'd be at least one phone.

— 마더 (2009)