하겠다고

that [someone] will do

→ 하다
하 do; be + 겠 future tense + 다 Plain declarative ending + 고 And
verb · future tense Uncommon #15,538
that [someone] will do Quotes an intention or promise; often followed by a verb of saying.
KO: 제가 직접 하겠다고 말했어요.
EN: I said I would do it myself.
Conjugation of 하다

내가 직접 협상을 하겠다고 해요

They say they’ll negotiate themselves.

— 옛날 옛적 서부에서 (1968)

대화를 하겠다고?

You want to talk?

— 언터처블: 1%의 우정 (2011)

꼭 하겠다고 해서요 안 된다고 할 수가 없었어요

They said they really wanted to do it, so I couldn't say no.

— 순응자 (1971)

이것도 못 하면서 무슨 연기를 하겠다고.

If you can't even do this, what kind of acting are you going to do?

— 국보 (2025)