在这部“坏小子”乐团剧情/音乐/传记片中,影片改编自真实故事，一群在少管所接受改造的问题少年们冲突不断，以雷公（林哲熹饰）和高少（纪言恺饰）为首的两派更是时常剑拔弩张，令王科长（连凯饰）很是头疼。直到新院长（萧蔷饰）到任，她希望用古典乐来教化这群问题少年，并特意聘请了乐团团长（金士杰饰）的女儿（程媛媛饰）担任音乐老师，于是这帮“坏小子”们开始了放下武器、举起乐器的乐团生活，直到一次大赛前夕……
Young criminal Lei, after failing his repeated attempts to escape from prison, joins a classical music ensemble, taught by a teacher who is helping the criminals there turn over a new leaf by preparing them for a music contest. Unfortunately for Lei, he finds out that his bandmates are newbies when it comes to music.
