the idol life is very tiring and difficult. especially when you are an Omega. When someone reach 20 years old, they will get checked for their status. the other member of bts always felt so attracted to jimin's smell and they couldn't help it but to protect the tiny member from any other scum trying to get near him. Even jungkook and taehyun who doesn't even know their status yet.

Namjoon, yoongi and hoseok are  Alphas while jin and taehyung are Betas. jimin is an Omega and every member is convice that jungkook will become an alpha because the maknae kept growing until he is at least a head taller than jimin. the maknae finally reach 20 years old and everyone congratulating him because he is an Alpha. 

of course having an Omega in the dorm will be hard but the Alphas only think jimin as their little brother that they need to protect. but not for the youngest Alpha...