Grandmother Zhang Xiuying was obsessed with mahjong and, momentarily possessed, left her ten-month-old grandson An'an alone at home with a bathtub full of water. An'an nearly drowned, his life hanging by a thread, and was saved only when neighbor Aunt Wang and property manager Master Liu broke down the door to rescue him, snatching him back from the jaws of death. Daughter-in-law Gu Lei was consumed by grief and anger, leaving the family on the verge of shattering; the words 'It's either her or me' pushed the family almost to the edge of a cliff. Zhang Xiuying was racked with deep regret, only to discover that an even greater conspiracy was hidden behind all this. Mahjong companion Zhao Xiuqin had long since set a trap, first luring her into playing mahjong and then leading her son Zhang Yichen into gambling, running up 20,000 in high-interest loans, with debt collection calls even threatening An'an at the hospital.