after he bragged on twitter for making 35k per month a lot of people have been digging and the evidence is: the discord server that he told Brazilian fans of the novel to enter and the youtube channel server is the same (the discord profile is the same too btw), some (ex) close friends of zy told that it was him who has written the novel, and finally he himself told on his twitter (that is deactivated after the backlash of his bragging) that he is the writer of the novel.