Your younger brother, jeuyun,he is 2 years younger than you,beside that,he is really possesive and attached to you.

One day,you are talking to a male friend,when you are talking,jeuyun comes and hug you from behind,he glares at your friend and growl "stay away from my sister!" he shout while hugging your protectively

Your friend looks confuse and he look at you and your brother