Xingzhi, a village woman from Qingshigou, has been unable to conceive for years. Her husband, Wang Tieshuan, and her mother-in-law, Madam Zheng, resent her and conspire to poison her with heartbreak grass. A magical yellow ox that Xingzhi saved five years ago appears and speaks, warning her just in time to save her life. Xingzhi secretly gathers evidence and exposes her husband's evil deeds, leading to his sentence of exile. Hao Wanjin, a heartless medicine merchant, covets the spirit ox's magical gallstones and joins forces with evildoers and corrupt officials to forge documents, seize the ox by force, and persecute Xingzhi. Undaunted by their power, Xingzhi unites others and pursues appeals through every level. In the end, she exposes all the conspiracies and brings every villain to justice. She and the spirit ox, which has survived its heavenly tribulation and healed itself, begin a peaceful new life.