Omegaverse is a popular trope in boy's love stories. It's a different world structure where there's 3 genders (on top of the binary male/female) which are Alpha, Beta, and Omega. Alphas are the top, ruling class or just 'dominant', Omegas are the opposite and are like the 'home-makers' etc., and Betas are like normal people. Sometimes people will write Alphas and Omegas with special abilities (in Western stories, some people make it very werewolfy) and sometimes not. In my story, everyone has heightened scenes to other people's scents when it comes to distress, anger, happiness, arousal. And while Alpha and Omegas have distinct scents, Beta scents are more neutral.
On the more mature side of it lol, Alphas have ruts, and Omegas have heats and Omegas can get pregnant (which is a reason why this trope is popular in bl)
Lol, I didn't realize I was going to write such a long answer. But I hope it helps and doesn't put you off the story