Chen Yan, a deliveryman, is always plagued by "strange happenings": an old clock he picked up dances by itself, and water in a chipped porcelain bowl floats above the surface with bizarre characters on it. Then a broken bronze mirror appears, shattering his ordinary life completely.
Before he can even delete the rent increase notice on his phone, the mirror suddenly reflects the ghostly figure of an old man in a blue robe. The landlord of the urban village dies a mysterious death, a black arrow that can suck blood sticking out of his back. An unfamiliar text message directs Chen Yan to meet at an old locust tree, where he is swept into a struggle spanning the three realms of humans, ghosts, and immortals.
When the bronze "Boundary Order" appears, stained with blood, he tumbles from the familiar rental apartment into the ancient, quaint world of "Lin Xu." The iron cavalry of the Boundary Suppression Bureau pursues him from behind, an old woman at the Crossing of Returning Souls covets his living soul, and even the storyteller on the street wears the face of a police officer. What secret is hidden in the broken jade left by Grandma Zhang from the orphanage? Why does the woman in the red dress in the mirror always watch him from the shadows? What connection does Wang Pangzi's death have to the theft of the Boundary Order three hundred years ago?
An ordinary man who cannot even afford his rent clutches a token that can open a passage between the three realms, fleeing for his life through a world where reality and illusion intertwine. He gradually discovers that his ability to "open his heavenly eye," his past at the orphanage, and even Grandma Zhang's death were no accidents. The eerie details he dismissed as "hallucinations" had long been planted as foreshadowing in his fate, and the "things beyond the boundary" he sees are, from the very beginning, the destiny he was meant to bear.
As the boundary between reality and the otherworld grows increasingly blurred, and every face around him seems to conceal two identities, Chen Yan must figure it out before he is devoured: Who is he, really? And where should he go?
