A Fist Within Four Walls DVD (TVB Drama)

In 1945, Bajiquan masters Duen Tung-tin and Chiu Mang-san form a brief alliance to protect the once-peaceful Kowloon Walled City from falling into the hands of ruthless gangs. The alliance breaks when Duen is poisoned and beaten to death by a mysterious assailant, and Chiu is suspected to be the killer. Chiu allegedly commits suicide, his children separate, and the walled city falls under the control of triads.

Fifteen years later, Chiu's now adult son Chor Au-kuen returns to the walled city to find his long-lost sister. Concealing his true identity, he gets acquainted with Tiu Lan, the lady boss of a local hair salon, and finds a job as a water labourer so he can pay his rent. By chance, Kuen meets the dentist Duen Ying-fung, the only son of Duen, and finds that the Duen family has now closed down their Bajiquan kwoon to start a dental clinic. Fung is skilled in Bajiquan but only trains it in secret, as he does not want to be seen as a threat against the city's leading triad organisation, The Fellow Association.

To protect the city's people against the growing power of The Fellow Association, Kuen and Fung recruit other kung fu practitioners to form the Kowloon Walled City Welfare Association. Though naturally gifted in martial arts, Kuen refuses to learn Bajiquan from Fung, as he believes that his father's Tiger Climbing Mountain fist to be the strike that had killed Fung's father fifteen years ago. Instead, Kuen takes up the mentorship of store owner Yuk Bo-fung, a retired kung fu master, and learns mixed styles of Muay Thai and Wing Chun. Her son Lung Shing-fu, the right-hand man of Fellow Association leader Or Man-cheung, finds his loyalties divided.

A leader of The Fellow Association mysteriously dies under the hands of a Bajiquan master, and Fung becomes the number one suspect. Kuen and Fung investigate, and the case leads them straight to Fa Man, the leader of a stripping dance troupe. As the drama progresses, more mysteries behind the deaths of Chiu and Duen begin to unravel. Kuen finds that The Fellow Association is not the only society that is plaguing the walled city with evil.