依依是一个三岁的小女孩，她的妈妈叫李少云，是一名夜班的士司机。依依5个月大时，李少云成为单亲妈妈，独自带着女儿生活。从那时起，她驾驶的这辆出租车带着依依一起讨生活，寒来暑往，母女俩一起度过了近千个不眠之夜。

Yiyi is a three-year-old girl. Her mother is Li Shaoyun, a night taxi driver. When Yiyi was 5 months old, Li Shaoyun became a single mother and lived alone with her daughter. Since then, the taxi she drove with Yiyi to discuss life, cold and summer, the mother and daughter spent nearly a thousand sleepless nights together.