Special World 4512. An interstellar world. Huo Ling thought. He remembered this world, not because it is an advanced world, but because of the setting of this world.
Special World 4512 isn't just an interstellar world, but also an ABO world. ABO, or the acronym for alpha, beta and omega, the secondary sexes aside from the two primary sexes – male and female. Because of the creation of the secondary sexes, there were now six classification of sexes: male alpha, female alpha, male beta, female beta, male omega, and female omega. The alphas can't give birth, while the omegas can, most especially the female omegas who are the most fertile. Although male omegas giving birth sounds absurd, but they can't do anything about this. Meanwhile, the betas are like the ordinary humans. Male betas can't give birth, but female betas can. So, their reproductive organs are like the ordinary humans.