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건 알아요

I know that...

→ 것+은
phrase Rare #24,121
I know that... 건 is a shortened form of 것은, which turns the preceding clause into “that…” or “the fact that…”.
KO: 네가 열심히 공부한 건 알아요.
EN: I know that you studied hard.

기분이 안 좋은 건 알아요

I know you're in a bad mood.

— 타이타닉 (1997)

우리가 사고 친 건 알아요

I know we messed up.

— 문라이즈 킹덤 (2012)