Former 1960s flower children Steven and Elyse Keaton raise their conservative son Alex, daughters Mallory and Jennifer, and later, youngest child Andrew.

Set in the 1920s, it revolves around aspiring architects and their contributions to the country.

This drama is set during the revolutionary time in Shanghai, based on a novel of the same name of Hai Fei. During the republican revolution, Chen Shen is a secret agent under Special Operations Executive Director Bi Zhongliang, among the agents called “sparrow” (similar to the program “zero” in Japan)