What is a polite way to ask a girl for her number?

You can say '번호 좀 얻을 수 있을까요?'

But before saying that, you'd better have some reasons.

like,

'얼굴이 너무 예쁘신데...'
or '관심이 있는데...', '친해지고 싶은데, 나중에 저녁이라도 같이 할래요?'

something like that.

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https://youtube.com/c/koreanlabX

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