How do you know!

#. How do you know? 

어떻게 ~을 알아?

 

Really? How do you know all this?

> How do you not know? Everyone is talking about it. 넌 어떻게 모르니?

I'm in shock. 나 충격 먹었어.

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How do you know each other?

How do you know this is fake?  @ feɪk 가짜의, 거짓된

How do you know how to fix a car?

How do you know him?

How do you know the history so well?