In an ancient-style town, Shen Xiaoman, the proprietress of Dongfeng Inn, is overwhelmed with preparations for the Hundred Families Feast. Unexpectedly, the host's wooden sign and the blue-covered account book suddenly go missing, throwing the seating arrangements for twelve neighborhood households into disarray. Determined to uncover the truth before dawn, she joins forces with accountant Xu Suanpan, cook Hu Sanniang, waiter A Tuan, and others to investigate, encountering one hilarious misunderstanding after another along the way. As the clues gradually come together, they discover that the missing items conceal more than meets the eye, with the investigation also exposing omissions in the guest list and unfairness in seat allocation. Faced with accusations and doubts, they refuse to jump to conclusions, insisting instead on verifying the evidence, making the facts public, and correcting the mistakes.