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한테 말할 거야

will tell [someone]

→ 한테
phrase Rare #31,291
will tell [someone] 한테 marks the person being spoken to. The subject is often omitted and understood from context.
KO: 내일 선생님한테 말할 거야.
EN: I’ll tell the teacher tomorrow.

톰은 자기가 바쁘다고 메리 한테 말할 거 야.

Tom will tell Mary that he is busy.

덴버 한테 말할 거 야?

Are you going to tell Denver?

— 라라랜드 (2016)

수 한테 말할 거 야!

I'll tell Suhan!

— 필사의 추적 (1981)