It seems that many HP fanfics want to write one of their own to satisfy their own little taste. Everyone is welcome to watch. The author's writing is incompetent. The main idea is that the protagonist (who doesn't know HP's story) accidentally time travels to an orphan and grows up with V. Later, he travels back to Harry's era again with V's child, saves V., And finally the family lives happily together. It's probably a story.