Jiang Hu is a 2004 Hong Kong crime drama film revolving around Hong Kong gangs. It was directed by Wong Ching-po and stars Andy Lau and Jacky Cheung, in their second collaboration after As Tears Go By, which is regarded as a thematic sequel to the latter. The film is also known as Blood Brothers in Singapore, and Triad Underworld in the United States.

Jacky Cheung Hok-yau is a Hong Kong singer and actor. Dubbed the "God of Songs", his accolades include the World Music Award (1996) for “World’s Best-selling Asian artist”, the Billboard Music Award (1994) for “Most Popular Asian Singer”, and a Guinness World Record for the largest combined audience for a live act in 12 months. In 1999, Cheung was honored by Junior Chamber International as one of the Ten Outstanding Young People in the World. He is the best-selling music artist of all time in Taiwan and Hong Kong with album sales exceeding 25 to 60 million records worldwide. Known for his vocal delivery, Cheung is widely regarded as a Heavenly King of Cantopop music, and an icon of Hong Kong popular culture.