In essence they kidnapped his grandma too, and forced him to sign a contract taking advantage of his vulnerable situation, because if he doesn't firms he will lose the one chance he has to save his grandma.
Man his fathers colleagues are a bunch of assholes, and they are still not explaining why they kidnapped him, they even have the right to deny him meals based on combat performance.
And these guys are the ones trying to "save" the world.
Wonder when they will put a collar bomb on him?