Can someone spoil it for me I heard he will have a child (≧∀≦)

Well not in the sense , he "birthed" a child , but the child came from that mana stone in him . And since it hv fragment of hyunjae (? forgot his name) , ppl consider yoojin and him as the child's parents :> and if im not mistaken whats born from the mana stone is a beast actually (?) who can shift into a child , or the other way around ? Or was it just a 'beast' .. that part im gonna need someone else to confirm lol