Wangjia'ao, deep in the mountains of southern Henan, was once shrouded in strange clouds - strange noises were heard after nightfall, villagers got lost for no reason and rushed to the barren ridge late at night, and even horses refused to set foot on the mountain road. In a day when everyone is in danger, Li Xiulian, who has lost her son for half a year, hears the careful clatter of dishes from the kitchen every night. She and her husband scattered plant ashes, and in the morning they saw the faint footprints of their deceased three-year-old son, Xiaobao. It turned out that the child was reluctant to leave his mother, and turned into a spirit and returned late at night to clean the stove. This concern across yin and yang was misunderstood by the fearful villagers as evil spirits. When the secret was revealed, Mr. Yin and Yang burned the children's bones, and the mountain village returned to peace, leaving only the mother's eternal regret and the lingering longing on the ashes of the plants and trees.