be from

A : Where are you from? 
K : I'm from the States. 
A : Are you American? 
K : No, I'm Korean. 
A : Do you know exactly what "be from" means? 
K : Well, I'm not sure. 
A : Be from means your nationality. So, if you say you're from the States, that means you are American. You know what I'm saying? 
K : Oh, yes, I got it. So, I need to say I'm from Korea, but I live in the States, now. 
A : Exactly!