They have been friends for a long time since they were kids.
They love each other dearly as friends
they always tease, protect each other, always support each other all the time ... but everything changed when jungkook felt how he really felt about taehyung he tried to admit but he always refused, taehyung always said it was just a joke but because it's a chance that he'll be honest, there's always something coming into taehyung's life.
