With heavy snow sealing the mountains for three months, food and medical supplies depleted, six-year-old Huanhuan and everyone else are trapped deep in the mountains, watching their grandmother fall seriously ill and their younger brother run a high fever as everyone struggles to hold on. In this desperate plight, Huanhuan accidentally activates half a jade pendant, binding it to a two-realms crossing system, and steps with one foot into a modern world abundant with supplies. Vegetables and fruits that others discard become the food that keeps them alive; ordinary medicines turn out to be miraculous life-saving cures. From food and medicine to clothing and farm tools, Huanhuan shuttles back and forth between the two realms time and again, using the prosperity of one world to save another.