Mr. Tsan/ Leung Jan (Bryan Leung), is a doctor and master of Wing Chun, whose martial lineage traces back to the style's founder. He is grudgingly persuaded by Fei Chun (Sammo Hung), his lead student, to teach kung fu to Cashier Hua/ Chan Wah Shun (Casanova Wong), a patient hiding out at his residence. Hua had previously overheard a businessman named Mo (Fung Hak-on) and several of his men plotting to take over the town by killing the head of the town. Unfortunately, Hua made the mistake of warning Mo's wormy henchman, Master Yao (Dean Shek) and a trap was set that nearly cost the poor cashier his life. Whilst in hiding, Hua sends Fei Chun to warn the town head. Ignores the advice, the town head is later attacked by Mo's men, although it is unclear whether he escapes or is killed after a protracted fight.