Derek Tsang Kwok-Cheung (曾國祥; born 8 November 1979) is a Hong Kong film director and actor. The son of actor Eric Tsang, Chi-Wai Tsang got his start in the Hong Kong film industry working for director Peter Chan Ho-Sun after graduating from the University of Toronto Scarborough in 2001. He made his acting debut in Men Suddenly in Black (2003) and directorial debut with Lover's Discourse (2010), sharing the directing credit with Jimmy Wan Chi-Man. The duo was nominated for a Golden Horse Award for Best New Director in 2010.