阿左（张怀云 饰）自认是全台北最穷的国中生，为了改变这个现况，他把脑筋动到了学校储藏室中没有人管理的废弃物上，“如果把这些东西变卖给回收…”阿左盘算著，但是，他没有盘算到半路会遇到小天。 　　小天（魏汉鼎 饰）也自认是全台北最穷的国中生，也为了改变这个现况，他也把脑筋动到了学校储藏室中没有人管理的废弃 物上，“如果把这些东西变卖给回收…”小天也盘算著，但是，他也没有盘算到半路遇到阿左，阿左也对废弃物有兴趣。 　　阿左和小天互不相让，于是，一场废弃物争夺战在平静的校园展开，而这场尔虞我诈，两败俱伤的争夺战终将让他们开始反省为何社会存在著贫穷，让他们开始面对即将到来成人世界……Lefty, seeing himself as the poorest high-school student in Taipei, plots a way to earn more money. He decides to steal the Dr. Sun Yat-sen statue abandoned at his school and sell it for cash. However, when Lefty and his gang embark on the heist, they chance upon another group of teens, led by Sky, and with the same goal in mind. Now it's a battle of wits.