Omegaverse doesn't have any set rule or original rule. Ever since it became popular (stemming from fanfics), a lot of versions have already been established. The only common points they probably have, are the male pregnancy, and the three sexes (alpha, beta, omega). What you see in a lot of famous mangas are actually watered down version of Omegaverse. Fargo's version is actually one of the more scientific approach to omegaverse (well, there's technically no science when it comes to omegaverse, but some versions, such as this one, have taken the concept of mendelian genetics). The alpha, beta and omega populations may vary depending on the author's preference. Same goes for who can conceive and such. Like, how some authors only establish male omegas to be the ones (among males) to get pregnant, while some authors allow alpha males to get pregnant as well.
No, omegaverse has always been an "up to the Creator's interpretation" kind of world. Personally, I like this version better.
I love the story.. but the rule of omegaverse in this manwha is not established and very inconsistent from the original rule (depends if beexboy or the anthology).. the population of both omega and alpha should be [rare] and omegas are treated to be the lowest while betas are the [common] and [normal] that are treated normaally with no conflict..
I still love the story even with the inconsistency