The greens shrank further and further in the city, while the pressure of daily life grew heavier and heavier. But Tian Ben and his mom still held fast to the little green on their own balcony until one day when the balcony turned into an open field, a huge tree grew in the house and the ox edged its way into the apartment! Grandma living in the village gave Tian Ben a patch of land as gift, and what surprised most was, this field could fly! How could they go back to their original life? Would the city change for better? The story, combining imagination with reality, deals with hotspots issues such as growth, parent-child communication, school education, ecological conservation, and rural revitalization.