Rules are something the living can talk about, but the dead have to follow them even more.
Gu Damin, a mediator at the Chunfengli neighborhood office and a former Grade A candidate for the Spirit Security Bureau, brought home an old book filled with rules the day he was fired. He can see the rules behind supernatural tales: when a sinkhole demands seven people, he exploits a loophole at dusk to save them; when an evil spirit demands an explanation, he makes it sign an agreement with its target.
Then Bai Lan, a cold-faced female special agent, comes knocking. She shuts down his street, tears apart his stall, and presses a gun to his forehead, calling him a "con artist who sets up his own court of law."
He smiles and slaps the agreement down in front of her. "Tearing it up means breaking the contract. Captain Bai, are you sure you want to break my rules in front of thirty-seven stall owners?"
Later, she becomes the hardest "case" he's ever had to mediate: if he can't keep her in check, he can't keep the city's supernatural tales in check; and if he does manage to keep her in check, he'll first have to rein in the feelings he can't bring himself to confess.