The Undaunted (1973)

A brilliant non stop fist to face kung fu action: from this great prolific producer, Lam Tien Hong. Li arrives in Shanghai to learn that his friend Chin has been mysteriously murdered by a killer using brass knuckles. Li swears to the sister of his friend to avenge the deceased. Li suspects Mr. Muchila, a wealthy Japanese drug dealer, so boxer Li makes a visit Mr. Muchila and takes his organization apart man by man.