말 안 해 줄

won't tell

→ 말
phrase Rare #20,138
won't tell A phrase meaning not to tell someone; 줄 is the future form of 주다, which adds the sense of doing something for someone. The person being told is often understood from context.
KO: 그 비밀은 말 안 해 줄 거야.
EN: I’m not going to tell you that secret.

내게도 말 안 해 줄 거 야?

Aren't you going to tell me too?

— 내 어머니의 모든 것 (1999)

전 비법을 알고 있어요 그렇지만 말 안 해 줄 거 예요

I know the secret, but I’m not going to tell you.

— 안드레이 루블료프 (1966)