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เรื่องราวของนักฆ่า 12 ราศีสุดมัน
Zor Yen (Chin Siu Ho) was one of the 13 assassins of Lord Yim Sai Fan (Law Lok Lam) in the Ming Dynasty. The 12 assassins were according to the zodiac signs and Zor Yen was the most capable, 13th 'Man Killer.' He was ordered to execute the entire family of Yeung Kai Sing, his lord's enemy. The daughter-in-law of the household, Mok Chi Lin (Ada Choi) was having a baby at that time, and after Zor Yen killed everyone in the family, he killed Chi Lin.
Just then, some mysterious man (later identified as the Sabre Devil) came by and threw him a mirror, which awakened his conscience eventually as he kept on looking at it. Zor Yen then wanted to leave his lord because he didn't want to kill anymore. Yim Sai Fan then took away Zor Yen's kung fu and tried to kill him but he escaped.
When Yeung Wan Ching (Eddie Cheung) who was away at the time came back, he saw that his whole family was murdered and his son was missing. He vowed revenge and when he was wandering around, he met Siu To (Carol Yeung). Siu To was a maid of Zor Yen who tried to rescue him from Yim Sai Fan. Wan Ching and Siu To eventually run in to Zor Yen who was on his way out. Zor Yen then realizes that he had killed Wan Ching's entire family, and he cannot get over the guilt so he leaves.