In the twelfth lunar month of frigid winter, the widow Su Wan was washing clothes by the river, and fished a critically wounded golden dragon pierced by an arrow from the bottom of the river. She risked her life to hide the dragon at the bottom of her tub, and from then on her destiny was rewritten. The village bully Zhang Caizhu pressed closer step by step, destroying fields and cutting off food, setting fires and killing people. Su Wan repeatedly fell into desperate straits, and the white jade pendant in her palm triggered the dragon luck of "turnaround of times"—the paralyzed mother-in-law stood up overnight, the fake Taoist priest suffered immediate karmic backlash, and the bullies and corrupt officials successively reaped what they sowed. When the golden dragon manifested in the world and asked her if she was willing to enter the dragon gate to enjoy longevity, she instead turned and walked toward the human world, leading the whole village to build a public granary and establish iron rules, transforming from a bullied widow into the universally revered "Su Grain-Keeper".