Siu Sheung (Juno Mak) is a solitary and frustrated young man. He works as a delivery boy at a small noodle shop and lives with his mother (Pat Ha) in a large, dilapidated Kowloon housing estate. As a young boy he enjoyed nothing more than watching his favourite anime, Space Emperor God Sigma, and singing along to Leslie Cheung's theme song with his father. However, after seeing his dad shot dead trying to apprehend a bank robber, Siu Sheung has spent the last twenty years wandering aimlessly, looking for a way to bring justice back to the community