Sixteen-year-old Chinese rising star Lei Wu plays the film’s young hero, alongside Hong Kong veterans Tony Leung and Carina Lau. Eighteen-year-old newcomer Zhang Yi Shang is the female lead and love interest. The international elements of the cast are made up of American actor Matt William (based part-time in Beijing, Knowles speaks fluent Mandarin and is well-known to the local audience from roles in Chinese TV dramas like Love Me If You Dare, Deng Xiaoping and Red Star Over China), stuntman Damien Walters (Captain America: The First Avenger, The Huntsman: Winter’s War) and British contortionist Bonetics Junior.