AU YEUNG WAI-LAN (Yuen Qiu), owner of a martial arts training school, is reunited with her long-lost son KOO YU-CHEUNG (Kevin Cheng) after years of agonizing separation. On his return home, CHEUNG is shocked to find that his younger brother KOO YU-TONG (Ma Kwok Ming) has been critically ill and that his father was murdered long ago by WING TAK (Lam Ka Wah), the existing director of a pharmaceutical company and a bitter old foe of the KOOs. CHEUNG has never been into kung-fu but shows glimpses of his potential when he strikes back at the impudent, arrogant WING MAN-KWAN (Jacky Heung), also the son of TAK. Pinning all her hopes on CHEUNG, LAN not only teaches him a special set of kung-fu skills created by the family, but also registers for him for the Guangdong Boxing Championship Tournament. Out of the blue, CHEUNG's opponent in the final turns out to be KWAN.