The background of the story "Good Night Beijing" is that the acceleration of urbanization has led to the excessive concentration of young people in big cities. At present, housing prices are rising, resources and environment are becoming more and more tense, and there are a series of "restrictions" such as housing restrictions, car restrictions and "cleaning up low-end industries". The policy is too fast and the pace of life is too fast. The economic pressure and the continuous tense living environment make these young people who are trying to stay in Beijing begin to rethink and choose their destinations ... Just like the title of the film, the theme of Good Night Beijing is to give warmth and comfort to those who are running for their lives, but the film adopts a realistic style with literary temperament to target the homeless, but still has dreams. Quasi-Beijingers tells the story of "drifting north" and "Beijing dream" with the love and work experience of David and Xiao An as the main line. At the same time, through the story auxiliary line, Li Jiankang, a fellow villager of Dawei, and Liu Jie, the landlord, tell the different experiences and living conditions of two generations of "drifting north", reflecting the epitome of urban development in the past 30 years of reform and opening up. In fact, every wandering city in the film has an "urban dream" in its heart. Although the film took place in Beijing, children can be found in Shanghai, Guangzhou, Shenzhen or all small and medium-sized cities, whether David is young or Li Jiankang, a "pseudo-Beijinger". Through the story of "drifting to the north", the film tells the current situation of all young people wandering in cities such as Beijing, Shanghai and Guangzhou, as well as the urban dreams of foreigners in Qian Qian.

As a movie about dreaming, warm and inspirational emotional elements have also become a highlight. Although David and Xiao have no place to live, they are poor and romantic, but they still temporarily "go home" to entertain friends from time to time. "More money and less affection." David and Ann have never lost their most precious things. This kind of anxiety of "advancing and retreating together, suffering together" also gives comfort and confidence to lonely urbanites.