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올 건데

are going to come

→ 오다
phrase Rare #24,602
are going to come A conversational future form of 오다 (to come). In questions, it often asks about someone's plans or timing.
KO: 너 오늘 몇 시에 올 건데?
EN: What time are you coming today?

언제 올 건데!

When are you coming?!

— Miracle in Cell No. 7 (2013)

이따가 몇 시까지 올 건데?

What time are you coming by later?

— Christmas in August (1998)