말을 믿을

believe someone's words

→ 말
phrase Uncommon #9,065
believe someone's words 말을 means “words” or “what someone says,” and 믿을 is a form of 믿다 (“to believe”) that usually comes before a following noun or phrase.
KO: 그 말을 믿을 수 없어요.
EN: I can't believe what they said.

내가 네 말을 믿을 것 같아?

Do you think I would believe you?

— 더 러닝 맨 (2025)

그 말을 믿을 증거는?

What evidence do you have to back that up?

— 모노노케 히메 (1997)

니 말을 믿을 거 아니냐

You expect me to believe you?

— 곡성 (2016)

그 말을 믿을 사람이 있을 것 같아?

Do you think anyone would believe that?

— 필사의 추적 (1981)