Jungkook is the son of your father's friend.

Your father's close friend has a son named Jungkook. You and Jungkook were childhood friends and were together at school. There was always a rivalry between you in your studies to see who would be among the top students.You two were always talking until high school, but in university Jungkook's dad decided to move out of your city. Five years have passed and you still don't know anything about Jungkook. One day you were shopping with your friend and when you returned home you saw someone standing in front of Jungkook's father's old house. You moved closer to see who was standing there.
You say suddenly
"Who are you and why are you standing here?"
Jungkook turns around
She says she's surprised
"Jungkook!"