The Incredible Kung Fu Master

The brothers Fei and Pang became rivals after a public debate about who was the superior fighter. Their friendly competition to protect the town from bully Yeung Wai硬化 into pride and bitterness. They each opened their own martial arts school to prove they were better than the other, turning their sibling bond into a competitive feud.

Their early victory against Yeung Wai earned them public praise, which planted the seeds of pride that later divided them.

Big Dog and Little Dog were not actually Chin Fung's sons. They were impostors sent by Yeung Wai, Chin Fung's kung fu senior, to spy on and learn the brothers' martial arts styles. The scheme was designed to gather intelligence so Chin Fung could crippling Fei and Pang for revenge.

Chin Fung's sudden interest in hiring both brothers to teach his sons seemed generous but was actually part of a deeper scheme.

Chin Fung hired Fei and Pang to teach his supposed sons so he could learn their kung fu styles inside out through the impostors. His ultimate goal was to cripple or destroy both masters as revenge, likely orchestrated by his kung fu senior Yeung Wai who had a grudge against the brothers.

The timing of Chin Fung's hiring coincided with Yeung Wai's earlier defeat, suggesting a calculated revenge plot.

Sei Leng Chai was a young kung fu enthusiast who befriended the wandering master Fei Chai. Following Fei Chai's advice to learn as many styles as possible, Sei Leng studied with Fei Chai, then with Fei, and with Pang. This training connected him to both brothers and positioned him to intervene when their feud threatened the town.

Fei Chai advised Sei Leng to learn from every master, which naturally led him to train with both feuding brothers.

Sei Leng Chai killed Chin Fung during the climactic confrontation. After discovering the truth about the scheme with the fake sons, Sei Leng turned against Chin Fung and defeated him, ending the merchant's attempt to cripple the brothers.

Sei Leng's broad training from both brothers gave him the skills needed to challenge Chin Fung.

Fei Chai defeated and killed Yeung Wai. After Yeung arrived at Chin Fung's estate, defeated Sei Leng Chai, and captured him, Fei Chai rushed in to rescue Sei Leng. In the duel, Fei Chai killed Yeung Wai, ending the threat posed by Chin Fung's kung fu senior.

Fei Chai's earlier mentorship of Sei Leng Chai set up his involvement in the final confrontation.

Yeung Wai was Chin Fung's kung fu senior, meaning he was a senior martial arts master in Chin Fung's lineage. This relationship explained why Yeung orchestrated the revenge plot against Fei and Pang - he was using his influence over Chin Fung to exact revenge for some past grievance, likely stemming from his earlier defeat by the brothers.

Yeung Wai's defeat at the hands of Fei and Pang established the original grudge that drove the entire conspiracy.

Sei Leng Chai intervened during a confrontation between the brothers when their feud threatened to tear the town apart. His help during the crisis prompted the brothers to put aside their rivalry and reconcile. With the external threats from Chin Fung and Yeung Wai removed, Fei and Pang restored their bond and pledged to work together again.

Sei Leng's training with both brothers gave him unique standing to mediate between them.

Fei Chai was a wandering winemaker and master of many kung fu techniques who became Sei Leng Chai's mentor. He encouraged Sei Leng to study broadly from multiple masters. During the climax, Fei Chai arrived to rescue Sei Leng after Yeung Wai captured him, ultimately defeating and killing Yeung Wai to end the threat against the brothers.

Fei Chai's advice for Sei Leng to learn every style foreshadowed his own superior fighting ability.

Yeung Wai held a grudge against the brothers Fei and Pang because they had previously defeated him in combat when they protected a civilian from the town bully. This defeat embarrassed Yeung and likely damaged his reputation. As Chin Fung's kung fu senior, he manipulated his student into hiring the brothers under false pretenses so he could learn their styles and arrange their destruction.

Yeung Wai's defeat in the opening scene established the motivation for the entire revenge conspiracy.