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Moments before his uncle is taken to be executed, Shen Yuan (Li Hsiu-hsien) writes down the cryptic words tattooed on the man's back...they are an invocation of some sort. Himself a crippled plantation manager, Yuan cannot win the attention of the girl next door whom he fancies, nor can he stem the abuses of his unpleasant boss. One day, pushed beyond his limits, Yuan remembers his uncle's invocation and utters it. He is immediately transformed into the Oily Maniac, an avenger of wrongs and hot-tempered foe of evil.