The Evil God of Hogwarts

The third-rate detective Xing Ze died while investigating a mysterious case and traveled to the world of Harry Potter with the pagan relics. However, he found that this Harry Potter world is full of dangers, mysterious organizations, ancient magic, and nameless gods. …
When Harry Potter, the star of savior, was preventing Voldemort from resurrecting, Xing Ze was destroying terrible rituals in a dark and backward town. When Voldemort was resurrected, Xing Ze wandered in the dark forest looking for ancient secrets. When Harry Potter finally When Voldemort was defeated, Xing Ze traveled through dreams to find a way to save the world.
This is an unknown story, a buried history. There is no hero here, only a stranger who wants to return to Earth.