“Siaulian”, who is released from prison and trying to turn his life back to track, runs into his childhood friend Tang, now a police officer, in a gang fight. Siaulian is wanted by the gangs since he has been made the one responsible for the fight. Siaulian is forced to form his own gang in order to protect his family and seek revenge. Eventually, he is wanted by both the gangsters and the police. As for Tang, he is struggling to protect his dearest friend as he is actually the reason why Siaulian was sentenced to prison.

顏正國自導自演新片《少年吔》，致敬名導侯孝賢監製的30年前經典電影《少年吔，安啦！》