Five different girls formed the most invincible "Iron" team in history. Lan Yiyi’s sly male husband was inexplicably missing due to owing huge debts. The four sisters went through a series of ridiculous oolong incidents to help Lanyi’s debts. They and a group of five people staged the "family" feelings of the ancient city of Beijing.

The film, using the years 1919-1927 and 1951 as its timeline, presents Li Dazhao's tireless efforts to save the nation and its people from multiple dimensions and in greater depth. With extraordinary courage to be a pioneer and shoulder moral responsibility, he actively spread Marxism, igniting the flame of hope for the Chinese proletarian revolution and becoming one of the important founders of the Communist Party of China. Furthermore, the film, based on the pioneering thought led by Li Dazhao, resonates with the values ​​of contemporary youth, achieving a dialogue of faith that transcends a century.