basically, Yoongi have been through some .

Yoongi have always been bullied an never had friends, but he've always had his family. things changes though...

when he's 16 his parents dies in a car crash, leaving him and his sister alone. when yoongi turns 18 his sister commits suicide and Yoongi gets depressed. a year after his sisters death yoongi tries to move on, he changes school, starts a new part-time job and moves to a new house. that's when he meets 7 wonderful people that changes his life. he becomes good friend with them and he feel like he can be happy again. 

or a story were 
Kim Namjoon and Jung Hoseok is yoongi's classmates
Kim Taehyung and Jeon Jungkook is his neighbors
Kim Seokjin works at the same part time job as him
and Park Jimin is a random guy he meets while working