Song Huizhen devoted her money and effort to helping her son and daughter-in-law run a postpartum care center for four years without pay. One day, driven by hunger, she ate a customer's meal that was about to be thrown away. Her daughter-in-law, Shao Yuwei, invoked the center's rules and insisted on fining her 3,000 yuan and making her apologize to the customer. Heartbroken, Song Huizhen dug out the receipts for the equipment she had paid for years earlier. Faced with a double standard in which rules applied when collecting fines but family ties were invoked when repaying debts, she refused to back down. She decided to reclaim the equipment she had purchased with her own money and use the rules to fight for the fairness she deserved.