年僅23歲、大學肄業的莊奕凡，想在台北市中心創造一處藝術家能毫無限制創作、人們能無拘無束唱歌跳舞的自由聚落，於是他在華山草原上撐起一頂大帳棚，開始了「草原自治區」的實驗計畫。120天內，聚落越擴越大，烏托邦逐漸成形，卻在某個夜裡爆發驚駭的殺人分屍案，兇手竟是草原上的藝術家，自治區被政府強制清場，莊奕凡也被社會輿論逐出草原。 自由的草原，吸引了眾人聚集造夢，也逼使樂土走向末路，經歷草原自治區的興起與幻滅，這一群被放逐的年輕生命，下一站又在何處？ 23-year-old Jhuang Yifan aims to build a settlement in Central Taipei, offering the artists a place to work with total freedom and the public a spot where they can sing and dance without any restrictions. As a result, he sets up a huge tent on the Huashan Grassland and carries out an experimental project called the “120 Grassroots Self-Autonomous Zone”. As the settlement is getting bigger and bigger, the Utopia gradually takes shape. Nonetheless, when the shocking murder and dismemberment of a woman happens on the Grassland, the authorities demolish the settlement and Jhuang Yifan gets chased out of the Grassland by the public opinion. Having experienced the rise and the fall of the 120 Grassroots Self-Autonomous Zone, where would this group of young people go as they are forced into exile?