그건 그냥

that's just

→ 그것+은
phrase Rare #19,929
that's just 그건 is a shortened form of 그것은 (“that is”), and 그냥 means “just” or “simply.” This phrase is often followed by a noun, adjective, or verb phrase to downplay or characterize something.
KO: 그건 그냥 실수였어요.
EN: That was just a mistake.

그건 그냥 장난 이었어요

I was just kidding.

— 더 위치 (2016)

그건 그냥 소음 이야

That's just noise.

— F1 더 무비 (2025)

그건 그냥 하는 말 이예요

I’m just saying.

— 라라랜드 (2016)

그건 그냥 멋져.

That’s just not cool.