Four-year-old girl Zhou Xiaohe, because grandmother Liu Zhaodi was addicted to mahjong, went out alone in the rain to deliver an umbrella to her grandmother, fell into a drainage well, and was rescued after being trapped for three hours. However, grandmother falsely claimed that the child was playful to shirk responsibility. Afterward, mother Lin Ning discovered that grandmother had secretly transferred her daughter's eighty-thousand lifesaving savings to play mahjong. Using ironclad evidence such as surveillance footage, transfer records, and mahjong game ledgers, she exposed her step by step, forcing her mother-in-law to sell gold jewelry, withdraw all savings, pay off all debts, and leave with her daughter to start a new life.