Hello, Tien. Thank you for your question about what is the difference between hear and listen.
We use hear for sounds that come to our ears, without us
necessarily trying to hear them! For example, 'They heard a strange
noise in the middle of the night.'
Listen is used to describe paying attention to sounds that
are going on. For example, 'Last night, I listened to my new Mariah
Carey CD.'
So, you can hear something without wanting to, but you can only listen to something intentionally. An imaginary conversation between a couple might go:
'Did you hear what I just said?'
'No, sorry, darling, I wasn't listening.'