Master of swindling Qian Wendi (Andy Lau), his girlfriend Lily (Christy Chung) and his friend "Golden Finger" Azhi cooperated to win 6 million Hong Kong dollars from the wealthy Liu Yaozu in a gambling game. Liu Yaozu was furious when he found out that he was cheated. He kidnapped Azhi and threatened Wendi to go to jail for him so that he could get back Liu's 300 million property from the prisoner Robinson (Kwan Hoi-san). Wendi was worried about the safety of his friends and had to obey. He went to jail to perform the task and entered the sphere of influence of his enemy, the prison guard killer Xiong (Tony Leung Ka Fai). Wendi quickly gained a foothold in prison with his extraordinary means, and even conquered the killer Xiong. As Wendi and Robinson got in touch with each other, he found that Robinson was actually Liu Yaozu's father-in-law. It turned out that Liu Yaozu had coveted Robinson's property for a long time and did not hesitate to kill his wife for this. Robinson was framed for revenge for his daughter and ended up in prison with a miserable old age. Wendy, full of a sense of justice, decides to help Robinson get justice, and joins forces with the killer Xiong to seize Liu Yaozu's ill-gotten gains...