Xiao Dou is a shy and naive mailworker living in Beijing with his sister. When a coworker is fired for reading people's correspondences Xiao Dou takes over the same mail route. He soon finds himself indulging in the same curiosity, eventually developing an obsession. Xiao Dou chooses to spend time reading letters instead of socializing with friends or coworkers. As he becomes increasingly tied to the letters, he begins to intervene in the lives of those who write and receive the letters.
Feng Yuanzheng
as 小豆
Liang Danni
as 姐姐
Pu Cunxin
as 姐夫
Huang Xin
as 云清
Zhizi Liu
as 所长
Zhixing Ge
as 老吴
Tianwei Zheng
as 宛娟
Zhou Qi
as 老夫
