小偷阿凯在与大哥猴子完成一次室内盗窃后准备金盆洗手，然而两人却在翻墙逃窜时碰到警报，二人分头逃窜之时，阿凯在公园被醉汉拦截，本无心留意的阿凯却在醉汉的身上看到过往的自己，阿凯冒着危险帮助醉汉后却锒铛入狱。几个月后，阿凯被人探监，走进后却发现当年的故事并没有那么简单......

A Kai the thief was going to quit stealing after committing a burglary together with brother Monkey, but they triggered an alarm when climbing over the wall. A Kai got intercepted by a drunkard when escaping. A Kai found the characteristic of himself of the past which reflected by the drunkard. A Kai took risk helping the drunkard but got caught and was sent to prison. Several months later, A Kai was visited by someone and found that the story of the old time was complicated.