后天是朋友婚礼，三个屌丝男在街头大排档小聚，为了让别人结账，三人就赛起了各自色色的经历。
影片根据真实事件改编，诺顿饰演的窗户清洁工一直以来都在独自抚养着儿子。但当3岁的孩子只剩几个月的生命时，他决定为他找一个崭新且完美的家庭。
退休沙展范根（冯淬帆）与高级警察李国江（黄锦燊）本是同胞，后因一闪严重过失，范根代替李国江承担责任而遭革职之后，范在贤姐（李殿朗）的发型屋内任发型师，并得到贤姐芳心暗许，但可惜范根爱子身染重病每年需要换血费用甚巨，范为替其子彻底治病，秘密为黑帮首领洪驹（王伟）任杀手。
阿B（李修贤 饰）是和母亲同住狭小老旧公寓的便衣刑警，他为人热血办案手法大胆，令新报道的同事阿杰（艾迪 饰）大开眼界。阿杰与阿B性格迥异，一心只想通过考试晋升警官。阿B压制分别住在山上村和山下村的两位大佬小黑与红番，并通过红番手下的毒虫小弟阿成（太保 饰）买得多个线报，阿B获悉犯罪信息立下功劳，令阿杰亦得到嘉奖，二人友谊日盛一日。不久，阿成因毒瘾反复发作，犯下大错，被小黑和红番连番毒打，终至丧命，阿B调查阿成死因，追查小黑，不料却引发意外，将自己逼上绝路，而小黑也只得选择铤而走险，警匪都再别无选择……
Benjamin Bernard has lived his life in the shadow of his brother. Torn between jealousy and loyalty, Benjamin takes out his aggression as a mixed martial arts (MMA) fighter. After an event nearly shatters the life of his brother, Benjamin must face his overwhelming feelings of anger and resentment as he discovers the truth about his family. As one brother fights for his life, the other must fight for reconciliation and redemption inside and outside the cage. This family film explores love, forgiveness, loss, healed relationship and, ultimately, the realization that we are all God's Favorite.
