[Cool and aloof female lead Xie Zhifei VS. Male lead Gu Heng, captain of the criminal investigation team] When crimes cross the boundaries of science and evidence pales before supernatural forces, who can turn the tide?
> Captain Gu Heng faces a series of bizarre bloody cases that defy all rational explanation: a perfect vanishing from a locked room, strange symbols on the victims, and distorted shadows in surveillance footage... His logical worldview is slowly crumbling.
> With nowhere else to turn, he knocks on the door of a teahouse called Wangyou Studio and finds a mysterious woman, Xie Zhifei, hailed as the "last Celestial Master."
> The cinnabar talismans at her fingertips can illuminate concealed crimes; the starry divinations in her eyes can see through the deepest lies.
> One unsolved case after another gradually becomes clear as science and the occult collide. But they discover that all the clues point to an ancient organization dormant for a thousand years, and a shocking conspiracy capable of overturning the world.
> With copper coins and red thread, how can they apprehend the demons lurking in people's hearts? Can steel firearms fight ghosts and monsters?
> This is a partnership on the boundary between light and darkness. What they must expose is the human heart, more terrifying than ghosts or gods.
Later on, the female and male leads get together, marry, have children, and continue solving cases.
This is the first time I have read this type of metaphysics. It feels more like Cthulhu than metaphysics.