Lin Wan is an appraiser at a gold shop in the county town, capable of telling real gold from fake in just three seconds. Yet in her in-laws' eyes, she's nothing more than a shop assistant. Her mother-in-law uses dish soap to strip away the gold from Lin Wan's dowry bracelet, but when it is returned, its core has mysteriously turned into copper. She then turns around and accuses Lin Wan's vegetable-selling mother of passing off copper as gold. Her necklace and gold bars are subsequently taken away for safekeeping, while her husband secretly takes out loans in her name. Suspended from work and thrown out of her home, Lin Wan remains calm and quietly takes her place at the appraisal counter of the company's flagship store, determined to reclaim justice one gram at a time with solid evidence. But a recording made seven days before her wedding reveals an even deeper scheme.