Buddha Assassinator aka Shogun Massacre is a 1979 martial arts film directed by Tung Chin-Hu, starring Korean kicker Hwang Jang Lee.
He has earned his high rank by using his Lohan Fist techniques to destroy the Ming rebels, who, in turn have targeted Prince Tsoi for assassination.
Enter Shao Hai (Mang Hoi), a naive kung fu scholar who earns a living by acting as a janitor for the local Shaolin Temple.
Shao Hai lives with his Aunt who adopted him, and learns the martial arts from his drunken master Uncle (Chien Yuet San, doing his best Sam the Seed routine), formerly a head monk of the local temple.
Meanwhile, both men have hidden themselves in the forest where Uncle begins training his nephew in the ways of the Buddhist's Palm; the only known method of counteracting the Lohan Fist.