阿枝（林明伦）与文仔只管追求物质享乐及崇拜英雄主义，且步上犯罪道路，结果事败落网。惟因两人家境不同，待判期间，阿枝得到保释，而文仔却要尝囚禁滋味，两人之间一向齐心的关系受到考验。可是，免被拘留的阿枝一点也不好受，他备受家人指责，朋友以为他背信弃义，令阿枝感到孤立委屈；最后，他竟选择了在狱中与文仔共同进退，更可藉此挽回半点英雄感觉。然而，他始终未能如愿以偿，在监狱这个微型世界中，眼见火爆的斗争，利益的冲突，但也感到的义气友情的一面；同时亦学晓了…

When his buddy Chan Hou-man is thrown into prison, Chi intentionally gets himself arrested by committing a pointless act of arson. Not exactly the brightest guy around, Chi soon finds out just what he has gotten himself into when he earns the disfavor of the head guard.