Do not call someone who is not known or unknown named neo (North), which means either you or her, because she is a known only to friends only or completely.
Not to call an unknown person or unknown named 너 (EA), which means that you or because she is a term used to refer to a specific friend or confidant only.
Will not call people who don't know each other or unknown named 너 (North), which means you or you because the word is used to call a friend or confidant.