Make sense. But why all the children always boy? Not just omegaverse but other fantasy manhwa too. Maybe the majority of story I've been reading that had kids, most of them are boys. Is this because the "cultural" thing? You know, since it's from those country.
I just had this thought when reading omegaverse. If the gender-XY and XX-is inheritance from their parents especially the Y chromosomes. Than if they MM couple, doesn't it impossible to get a daughter and vice versa?