You lived with your family consisting of your husband and two kids with jungkook as your elder son.It was in the future where time travel was made possible now

Jungkook was curious about time travel since ages but since it required the person who wants to time travel be an adult, he waited

on his 18th birthday,the wait was finally over..he went to the time travelling agency and time traveled to the past..when you were 18 too and haven't met his dad yet..

He looked at you from afar, you looked the same as you were in the future but even more innocent and lively, he smiled to himself looking at you

He was eager to talk to you but since time travel wasn't a thing in past and you'd think he's a creep if he tells you he's your son, he hid his identity

"hey..I was looking for a cafe I'm new here..do you mind helping me?" he said politely making an excuse to start a conversation with you