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Wait, their child who just 5 y/o, said he can cure cancer, built space station and it's artificial environment, want to make a country, and have fighting techniques. And they just like 'okay' ?!?! You know having high iq doesn't justifies right? Havin high iq is like having a pc with high end processor. Without any data, it's useless. And the adults just okay with it ? This story is good, but the granpa cancer BS ruins it. It would be more believable if he told his parent and gparents when he's at least a teenager.
the quirkless plan was pretty bullsh*t since he doesn't know if there will be quirkless government spies and not only that what if the quirkless people betray him cause not everyone is like him u know whats gonna happen in the future if quirkless be high and mighty without anyone to teach them in place it'll make sh*tty young masters like the xianxia novels thinking that they're so high and mighty
you are simply dividing the human race, you are not saving 1 billion but killing will vary future generations in the struggles between quirk and those who have quirk and probably quirkless will win, because they will have more technologies and growth potential ie you will be killing 80 % of the population.