'Guang' is an account of a high functioning autistic who struggles to cope with fundamental social tasks and obligations. Wen Guang's universe is to him, tangible and true. He manages to perceive how the complex environment surrounding him makes up the world, which is his and nobody else's. He goes on his unending quest to search for certain specific items to build something, only revealed to the audience at the end.
Guang is simply a victim of everyday life, which fails to understand him. The film is inspired by the life of the film director, Quek Shio Chuan and his autistic savant brother.