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Andy Lau as 刘健明（刘Sir） |
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Edison Chen as 青年刘健明 |
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Tony Leung Chiu-wai as 陈永仁（阿仁） |
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Shawn Yue Man-Lok as 青年陈永仁 |
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Anthony Wong Chau-Sang as 黄志诚（黄Sir、黄警司） |
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Eric Tsang Chi-Wai as 韩琛（琛哥） |
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Gordon Lam Ka-Tung as 林国平（大B） |
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Francis Ng Chun-Yu as 倪永孝 |
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Chapman To Man-Chat as 徐伟强（傻强） |
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Roy Cheung Yiu-Yeung as 罗继贤 |
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Hu Jun as 陆启昌 |
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Chen Daoming as 沈澄 |
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Huang Zhizhong as 沈亮 |
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Kelly Chen Hui-Lin as 李心儿（李医生） |
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Sammi Cheng Sau-Man as Mary（刘健明妻子） |
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Elva Hsiao as May （陈永仁前女友） |
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Carina Lau as Mary姐 （韩琛妻子） |
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Leon Lai Ming as 杨锦荣 |
| Directing | Andrew Lau Wai-Keung | Director |
| Directing | Alan Mak Siu-Fai | Director |
| Writing | Alan Mak Siu-Fai | Writer |
| Writing | Felix Chong Man-Keung | Writer |
