Yugyeom and BamBam were best friends... or so Yugyeom thought until BamBam started cancelling their weekly Friday movie nights (that have been a tradition for forever), or he constantly blows him off to hang with Mina instead. 

He eventually stops believing that they are friends when BamBam stops replying to his calls and texts.

Jaebum doesn't like it. He knows how shy his little brother is and how much he depends on BamBam  

Yugyeom is extremely shy so it was a miracle that he had Bambam as a friend to begin with. 

BamBam will completely ditch Yugyeom for a whiless than randomly come back 

He meets Jungkook they become friends and then BamBam becomes jealous of their friendship