Unbeaten 28 released in theaters September 1980 directed by Joseph kuo who has been creating for decades

The leader of the Kong Tung clan is Yen Chan Ying (Mark Long), a ruthless warlord who is master of 26 styles which gives him a tremendous advantage over normal martial artists. One day a proud man dares to step forth and speak against Yen Chan Ying's villainy. Sadly, the man's fighting skills are not as immense as his bravery and he goes down to Yen Chan Ying like so many others before him. The man's family members deliver his infant son to the nearby Abbot (O Yau Man) who in turn takes the baby to the well-to-do clan of Chen Yung (Jack Long), an honorable Kung Fu instructor who owes the baby's father a debt of gratitude. The Abbot informs Chen Yung to raise the boy as a warrior to take revenge on his father's killer, and hands him a special book to train him in the Iron Body style. One day while Chen Yung labors over the kids training, he leaves his family unprotected. This allows Yen Chan Ying to kill the rest of his clan. The obsessed Chen Yung now plans to use the kid, now called Tiger, to take revenge for not only himself, but Tiger's father as well. The kid quickly grows into a young man who displays considerable invulnerability and martial arts abilities.