Zhiguai means 'records of the strange'. It is an old Chinese tradition of short tales about ghosts, spirits, fox demons and marvels, recorded as if they were true. Modern mystery dramas borrow its mood, where the supernatural is the surface and a human culprit is behind it. The Tang Mist works this way: ghosts and fox spirits appear in each case, and Di Renjie's job is to find the people behind them.
Where it comes up

Silk & Schemes
The Tang Mist: Detective Di Renjie Goes South in a 25-Episode Mystery Season
A guide to the Tencent Video mystery The Tang Mist: Feng Shaofeng as Detective Di Renjie investigating supernatural-looking cases in Jiangnan, how the 25-episode season is built, and why critics and viewers weigh its atmosphere against its deduction differently.