There is a secret hidden in Xiao Yaya. Her old wallet is actually a passage to modern times. At first, I could barely survive on half a pickled braised egg. Later I learned that common wild vegetables in the mountains were valuable on the other side. Carrying a small bamboo basket on his back, he traveled back and forth between ancient and modern times, bartering to slowly earn a living. From not having enough to eat and living without a living, to having granaries full and smoke rising from the kitchens in small courtyards. The green hills remain the same, poverty disappears, and ordinary days gradually become filled with warmth.