In the 1960s, Guo Xiao Lu and Su Ling Fang met for the first time. They were supposed to have grown up together because of an accident for many years. The letter that will not arrive allows the two to embark on a different life trajectory, and also opens the fate of a lifetime. The reunion after a long absence coincided with the prosperity of the two, and they also had the company of Ding Meng Meng, Wang Xiao Mo and Wang Qing Wei. As the years go by, the fate of a generation is ups and downs in the torrent of the times. Guo Xiao Lu reunited with Su Ling Fang after experiencing life and death, and they made an unexpected choice.