只想著賺錢出人頭地，卻被騙到柬埔寨從事詐騙。劫後餘生回到台灣的20歲年輕人-蛇仔，因為薪水低、看不到未來，只是想要給懷孕的女友一個安穩的家，卻怎麼都做不到。滿心對政府的不滿，懷著戰爭來臨，財富、社會階級可以重新洗牌的幻想，遭誘惑而加入第五縱隊的地下組織。
解放軍登陸前夕，蛇仔受命拿著棍棒在街頭攻擊群眾，看著眼前必須下手的孕婦，他已經分不清，自己究竟是在建構未來，還是摧毀未來…。
At just 20 years old, Snake Boy survives a harrowing ordeal after being trafficked to Cambodia and forced into scam operations. Returning to Taiwan, he finds himself trapped once again — this time in poverty, low wages, and the hopelessness of trying to build a future for his pregnant girlfriend.
Disillusioned with the government and seduced by fantasies of war reshaping power and class, he joins a secret underground Fifth Column organization.
As the People's Liberation Army prepares to land, Snake Boy is sent into the streets with a club — tasked with inciting chaos and attacking civilians. But when he’s ordered to strike a pregnant woman, he’s forced to confront the truth:
Is he shaping a new future…
or destroying everything that could have been?
