I believe they were calling him an Omega as a means of bullying. In this story most males become alphas so it was a way to try to make him feel less than by emasculating him.
(I've tried to reply to this multiple times and it doesn't seem to have worked, so if you get a bunch of the same comments I'm so sorry ╥﹏╥)
Not yet, and that chubby friend (I think his name is Seung) gonna manifest as alpha. Most male prolly gonna be alpha here, that why since the start MC believe he's gonna be alpha too
Oooo!
I thought it was already revealed that he is an Omega and that's why he's friends with that chubby Omega?