该剧讲述了易安音乐社因社长林墨经营不善导致不断有人退社，只剩林墨、孙亦航、池忆三人。而实习老师何洛伊受弟弟何洛洛的委托，担任音乐社团的指导老师。原本对指导老师一职排斥的她却发现音乐社充满梦想，积极阳光，于是主动请缨，帮助音乐社重回巅峰。期间阻挠不断，困难重重，面 对解散危机之时她力保音乐社，音乐社众人也同心协力，然而初见起色之时又遭傅韵哲的“新声社”挑战。最终两个音乐社团结一心，齐力胜出，新的音乐社扬帆出发，少年如歌的青春也刚刚起航，他们在校园里肆意挥洒青春！

When a failing high school music club is left with only three members, a trainee teacher takes on the challenge of reviving it. Faced with setbacks and fierce competition, the group unites through their shared love for music, reigniting their dreams and setting off on a spirited journey of youth and self-discovery.