The Big Boss (Chinese: 唐山大兄, also known as Fists of Fury) is a 1971 Hong Kong martial arts action film written and directed by Lo Wei, with assistance from Bruce Lee. It stars Lee, Maria Yi, James Tien and Tony Liu. Lee's first major film, it was written for James Tien. However, when the film's original director, Ng Kar-seung, was replaced by Lo, Lee was given the leading role instead. Lee's strong performance overshadowed Tien, already a star in Hong Kong, and made Bruce Lee famous across Asia. Wikipedia
Cheng Chao-an: Beat it or I'll kill you right now.