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건 확실해요

it’s certain that

→ 것+은
phrase Rare #32,246
it’s certain that 건 is a shortened form of 것은; it introduces the fact or situation being described as certain.
KO: 그가 올 건 확실해요.
EN: It’s certain that he’ll come.

사람 많을 건 확실해요

It’s definitely going to be crowded.

— 나우 유 씨 미 3 (2025)

스파이가 아닌 건 확실해요

I'm sure they're not a spy.

— 아키라 (1988)