This work contains AI-assisted content generation. A bizarre swap case occurs in the bustling market, where a precious wood carving ornament is replaced by a counterfeit. A coarse-shirted man and a short-haired woman get involved in the investigation, and suspects appear one after another. As clues are dug layer by layer, the case is not merely greedy crime; behind the wood carving lies a story of filial piety, and a mysterious unfamiliar carved mark on the inside of the ornament leads to a hidden commission. Everyone heads to the suburban woodcraft workshop to explore the truth of the carved mark, and a larger mystery slowly surfaces.