Ancient mirror reappears**: The peaceful life of Lin Mo and Shen Xinghe was broken by a newly unearthed "soul-suppressing mirror" from the Tang Dynasty. The warning "In July and a half, a feast of ghosts" appeared on the mirror, indicating a new supernatural crisis.
- **Strange Murders**: Bizarre deaths occurred one after another in the city. The deceased all had strange smiles on their faces. Copper coins and red threads were scattered around the bodies, which is consistent with the "Yinshi Marrying Daughter" ritual recorded in ancient books.
- **Past life bond**: Lin Mo discovered that he had a past life connection with Xie Yaohuan, a female official in the Tang Dynasty, and Shen Xinghe's ancestor was actually the Taoist priest who sealed the mirror demon. The fate of the two was entangled again.
- **Yin Wedding Ceremony**: As the investigation deepens, an ancient "ghost marriage" ritual gradually emerges. Xie Yaohuan's resentful spirit attempts to complete the unfinished wedding through human sacrifices.
- **Mirror World Showdown**: On the night of the Ghost Festival, Lin Mo and Shen Xinghe were forced to enter the mirror world and face Xie Yaohuan's resentful spirit. They discovered that in order to quell the turmoil, they must unravel the distorted historical truth.
