y/n and jungkook are step siblings, Jungkook has a toxic mother and his mother married y/n's dad a year ago.. the relationship between her and Jungkook is awkward but it's filled with tension... He loves her secretly

One time you were struggling to do your math homework and decided to ask for his help, you went inside his room without knocking and then you froze

"Sh*t don't you know how to knock?!" He exclaimed in surprise