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Andy Lau as 刘健明（刘Sir） |
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陳冠希 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 as 韩琛（琛哥） |
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林家棟 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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張耀揚 as 罗继贤 |
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Hu Jun as 陆启昌 |
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陈道明 as 沈澄 |
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黄志忠 as 沈亮 |
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陳慧琳 as 李心儿（李医生） |
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鄭秀文 as Mary（刘健明妻子） |
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蕭亞軒 as May （陈永仁前女友） |
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劉嘉玲 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 | 莊文強 | Writer |
