The court on the rooftop is a place to sweat and unwind. People rise from the bottom part of the concrete forest to the upper air, viewing the city at a distance and breathing freely. Here, people are getting closer and attract each other in a rising but narrow space. Their lives seems to be as thin as watergrass in the ocean, but stubbornly refuse to confirm the survival principles. Only the wilderness and the city face each other silently. The city invades the territory of the wilderness, replaces the natural scenery with orderly prosperities. However, countless lonely and desperate individuals are hiding behind the prosperity. By exploring the relationship between these individuals, the most fitting gap between the wilderness and the city is revealed. To be kind to the wilderness is to be kind to human beings themselves, since city creatures can never defeat the wilderness which is the skin of nature.