Chengdu Rainbow is a nonprofit organization focused on the LGBTQ community — originally, it was known as Chengdu Milk. The film showcases the organization’s restructuring, efforts to build itself up, and subsequent decline. The main subject of the film, Matthew, is the founder of the organization and a member of the LGBTQ community. His initial motivation for founding it was to help LGBTQ individuals facing mental health challenges, but ultimately he also left due to his own mental health struggles.