**The Ancient Mirror Returns**: Lin Mo and Shen Xinghe's peaceful life is shattered when a newly unearthed Tang Dynasty "Soul-Suppressing Mirror" appears. A warning surfaces on the glass: "On the fifteenth day of the seventh month, a banquet for a hundred ghosts," heralding a new supernatural crisis.
- **A Bizarre Murder Case**: Strange deaths occur one after another across the city. Each victim wears an eerie smile, and copper coins and red thread are scattered around the bodies, matching the "Underworld Wedding" ritual recorded in ancient texts.
- **Ties to a Past Life**: Lin Mo discovers a past-life connection to Xie Yaohuan, a female official from the Tang Dynasty. Even more astonishingly, Shen Xinghe's ancestor was the Taoist priest who sealed the mirror demon. Their fates are intertwined once more.
- **A Ghost Wedding Ritual**: As their investigation deepens, an ancient "ghost marriage" ritual gradually comes to light. Xie Yaohuan's vengeful spirit is trying to complete her unfinished wedding with a living person as a sacrifice.
- **A Showdown in the Mirror World**: On the night of the Ghost Festival, Lin Mo and Shen Xinghe are forced into the world inside the mirror, where they face Xie Yaohuan's vengeful spirit. They discover that the only way to end the turmoil is to uncover the truth behind a distorted piece of history.
