해야겠다

should, will have to

→ 하다
해야 do; perform + 겠 future tense + 다 Plain declarative ending
verb · future tense Rare #31,392
should, will have to Often expresses the speaker’s decision or realization that they need to do something.
KO: 오늘은 이 일을 해야겠다.
EN: I guess I’ll have to do this today.
Conjugation of 하다

아이고, 저녁 장사나 해야겠다

Oh well, I guess I’ll just have to do the dinner shift.

— Tune in for Love (2019)

그러면 처음 생각했던 대로 해야겠다.

Then I guess I should do what I originally had in mind.

— 주토피아 (2016)

앞으로는 모두 이 방식으로 해야겠다

I guess I’ll have to do everything this way from now on.

— 너자 2 (2025)

너 때문에 다이어트 또 해야겠다

Because of you, I guess I’ll have to go on another diet.

— 히든 (2005)