普通百姓刘成（刘佩琦）为让从小拉小提琴的儿子刘小春（唐韵）的小提琴技艺有较大提升，带着他从江南来到北京，拜了性格怪异的江老师（王志文）为师，在学习过程中，刘小春逐渐与江老师成为忘年好友。风情万种的莉莉（陈红）与刘成父子俩住得很近，她让刘小春逐渐萌发生出莫名的爱恋。
　　刘成偶然聆听过一位年轻人的精彩演奏后，登门拜访了其恩师余教授（陈凯歌），并说服对方收下刘小春为徒。刘小春怀着无奈与遗憾离开了江老师，投身余教授门下，却只收获了束缚与压抑，他开始怀疑“父亲的选择”，与父亲的关系越变越紧张。

　　1949年的法国乡村，音乐家克莱门特（热拉尔·朱尼奥 饰）到了一间外号叫“塘低”的男子寄宿学校当助理教师。学校里的学生大部分都是难缠的问题儿童，体罚在这里司空见惯，学校的校长（弗朗索瓦·贝莱昂 饰）只顾自己的前途，残暴高压。
　　性格沉静的克莱门特尝试用自己的方法改善这种状况，他重新创作音乐作品，组织合唱团，决定用音乐的方法来打开学生们封闭的心灵。
　　然而，事情并不顺利，克莱门特发现学生皮埃尔·莫安琦（让-巴蒂斯特·莫尼耶 饰）拥有非同一般的音乐天赋，但是单亲家庭长大的他，性格异常敏感孤僻，怎样释放皮埃尔的音乐才能，让克莱门特头痛不已；同时，他与皮埃尔母亲的感情也渐渐微妙起来。

　　Maca (María Valverde), 30 years old and clumsy by nature, makes the most of life and strives to be happy. Maca's talent is wasted working as an assistant for an oppressive and terrifying fashion influencer and she spends her time with guys with whom she never manages to establish an emotional bond. Together with Jimena (Elísabet Casanovas) and Adriana (Susana Abaitúa), her two unique and lovable friends who are always ready to do whatever it takes to make their problems not seem so bad, Maca has managed to make Madrid a city where everything is possible. Everything seems to be going well until he-who-must-not-be-named comes back into her life. Leo (Alex González), the love and biggest mistake of her life, the man who tore her heart apart, obliterated her self-esteem and her faith in men, comes back into her life to turn everything upside down. Maca has tried to forget him, but now she has to accept that he has returned and face the emotions she has locked away to deal with the unforgettable memory of what could have been and never was. Old wounds are reopened and Maca will have to be brave and confront her conflicts, fears and insecurities in order to finally take control of her life.