About why people still don't believe him or recognize his abilities it should be explained in either the next chapter or the one after. In the novel it was like chapter 10 but was eluded to already in the entrance exam.
@boogle They've already explained due to the huge time gap from his time alive to now they've rewritten his name so many times that it's been misspelled.
what can one element do if he controls all of them..... and will it be incest if he makes a harem of those girls...since the cause of their creation is his blood..