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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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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 Ya-hsuan 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 |
