So basically back when Yoongi was a trainee, he had an ex girlfriend, Hannie. They broke up on good terms.

Turns out, Hannie was pregnant but when she found out, Yoongi had debuted. She didn't want their child to hold them back so she hid the pregnancy and raised the kid all by herself.

Y/n is now 18. She is basically like the female version of Yoongi down pat. She is cold and stoic. She is a professional boxer with an Olympic gold medal and many historic titles and awards.

Yoongi and the members found out about y/n one day after watching her win an Olympic gold medal in boxing. Yoongi reached out and talked to Hannie.

Currently the members and Yoongi were at Hannie's house. They just finished the conversation about why Hannie didn't tell yoongi about y/n.