Yan Zilang (Andy Lau), the iron-blooded conductor of an internationally renowned choir, returns to Hong Kong to help his former mentor (Lowell Lo) and leads a group of useless students who are forced to participate in the "Hot-blooded Choir Experimental Program" because of getting into trouble, and learns choral singing from scratch. They face the setbacks and challenges of life together, and eventually find themselves in music, and the secrets of Yan Zilang are gradually revealed...