Daughter brought her boyfriend Mick to home, so her father & Mick started conversation.
Mick: I know. You were in music band, right?
Father: You're impressing me already.
Mick: Well, I have your CDs.
Father: You're the one.
My Understanding: Still no one buy his CD's by saying one refers Mick is the first one to buy CD. since s word added to CD, that is why I am confused.