Tourist Lin Wan, while traveling with her mother, encounters ambiguous pricing by a seafood restaurant vendor. She remains rational and restrained, gathering complete evidence such as checkout receipts and surveillance footage. Lin Wan insists on defending her rights according to the law, publicly organizing years of consumption stubs. She does not pursue excessive conflicts, pushing the matter back to facts and rules. In the end, the involved shop completes refunds and rectifications, and the town's catering industry fully implements marked prices. With calmness and courage, Lin Wan guards her own rights and interests, also driving the local area to form a new atmosphere of honest operation.