Ah Yong (Zheng Zhongji), a brave and ruthless gangster, likes things with a sense of rhythm, such as fighting. But he is emotionally unstable, and the only mysterious Demo published online is a tranquilizer for his mind. Brother Xiong ordered Ah Yong to take care of a kidnapped girl Zi Mu (Yan Zhuoling) and trapped her in a fish raft floating on the sea. Scheming Zi Mu escaped many times, and the two fought fiercely one after another, and A Yong was surprised that the other side was the composer of Demo! In order to escape, Zi Mu pretended to give music therapy to the manic Ah Yong, turning the originally tense relationship into a most strange and absurd situation. Some writers wrote great works when they were in prison, but Zi Mu was inspired when he was kidnapped. The sound of wind, waves and water drips gradually become a group of rhythms. Suddenly inspired, she unexpectedly wrote a moving movement in such a situation. And Zi Mu even found that A Yong's voice is actually quite good, coupled with his usual fight and escape, he has a strong lung capacity and a wide range of voice. It turns out that kidnappers have a good voice! Music changes one person and makes two people know each other. They use their voice to change their fate and play music for their own lives.