The name of the documentary is taken from a protest motto, emphasising the need for unity in the face of pressure from Beijing.
Anders Hammer moved to Hong Kong in 2019 to capture a David versus Goliath battle on camera, filming pro-democracy protesters in the city taking on autocrats in Beijing.
The video that ends the film is the last one Siu recorded in Hong Kong.
“It was the biggest revolt against Beijing, and the political leadership [there] in a very long time,” Hammer said.