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그거 하나

that one thing

→ 그것
phrase Rare #26,481
that one thing Used to single out one particular thing, often with the sense of “that alone” or “that one thing in particular.” 그것 하나 is the slightly more formal or written form.
KO: 그거 하나만 기억해 주세요.
EN: Please remember just that one thing.

그거 하나는 확실해

One thing’s for sure.

— 똑바로 살아라 (1989)

그것뿐 이다, 그거 하나 야

That's all—just that one thing.

— 빅 식 (2017)