Ma fung gwai kuen (1979)

When young Tieh Chiao San is sent by his dying father to live with a former kung fu colleague in the town, he accidentally gets into trouble when messing with a gang running a snake-oil scam and then getting into a fight with an old drunkard. When Tieh reaches his destination he finds that the snake-oil gang is run by none other than his father's friend. He joins the gang but cannot bring himself to do the bad deeds demanded of him; this continues to the point where he is beaten and left for dead. Luckily he is rescued by the pretty Tsai Chiao and hidden out with her drunk uncle and leprosy suffering aunt as well as a Shaolin temple. Tieh uses his time to learn some new kung fu styles, which is just as well as it is not long till the gang come after him looking to finish the job.