The rapid growth of China’s economy and its large-scale developments brought about disorderly emissions, resulting in significantly worsening air quality. Increasingly serious air pollution seriously affected both people’s health and the country’s image; China’s neighboring countries started closely monitoring changes in air quality. As the mother of a one-year-old child, I really concern about the daily air quality more than most people. Therefore, I really wanted to know whether the government was taking action against the continually deteriorating air quality. How do environmental protection officials combat haze? What measures do they use? Are these effective? Is it possible to clean up the air? By chance, in early 2017, I read a news bulletin about Li Chunyuan holding a book signing event for his third novel about smog, and learned that he wasn’t just a writer, but also an environmental protection bureau chief in charge of air quality. My experience as a ten-year investigative journalist told me that he would surely become involved in lots of stories. A month later, I received exclusive long-term permission to film Li during his air quality control work. China is developing quickly, and the arduous task of curbing air pollution must be completed in a short period of time. In the absence of historical precedent, Li Chunyuan is like an explorer, trying various methods to clean up the air. Through my lens, I saw Li Chunyuan’s doubt himself: “These measures are effective in the short term, but how can we achieve sustainable development?” The development of history is like a big wheel, it rolls forward and never stops. As an individual, Li Chunyuan is unable to steer this wheel. His full-throated passion and idealism become insignificantly small within the system.​