There was no clear connection between Sanguine Red's novels," Tengen " and " Tengen 1 ", which could form an independent series. However, judging from the name, Tengen could be considered a follow-up to Tengen 1 because Tengen was usually used to refer to the first work in the series. However, this was not absolute, because the name connection did not necessarily mean that there was a direct causality between the works.
As a fan of online novels, I can't answer the question of how many wives the protagonist of the X-Dragon era has because this question may vary according to the author's writing style and plot setting. In some novels, the protagonist may have multiple wives, while in others, the protagonist may only have one or a few wives. Therefore, only the author knew the answer to this question.