故事讲述了一台来自过去的MP3，让年近30的大明星赵漫儿突然可以与11年前的自己通过录音进行往来，当她以为终于可以借此改变自己现在糟糕的人生、摆脱黑料的威胁时，却没想到令过去和现在的自己陷入了更大的危机……

Sun Xiaolei, a drama school student, is facing the first important competition in his life, but the delay in changing his voice makes him anxious. In the process of preparing for the competition, Xiaolei accidentally became friends with two competitors - Shi Jiahui, a boyish old girl, and Xie Tianci, who was born in a famous Beijing opera family. In the long summer, the three teenagers are about to face a "reversal" of puberty.

戏校学生孙小磊正面临着人生第一场重要的比赛，迟迟未来的变声期却令他焦虑不已。准备比赛的过程中，小磊意外和两个竞争对手--男孩子气的女老生时佳慧和出身京剧名门的谢天赐成为了朋友。三个少年在漫长的夏天里即将迎接一次属于青春期的“倒仓”。

孙小磊是个京剧好苗子，整个夏天他一直在为汇报演出的主角而努力，然而不知何时会到来的变声期让他惶恐不已。