In a war-torn era, Zhang Yan, a famous actor in the Peking Opera House, and Zheng Yuan, a mechanical engineer who had returned from studying abroad, became connected due to an unexpected encounter. One carries the mission of family inheritance, and the other carries the ideal of saving the country through industry. The two support each other in troubled times. As the Japanese invasion of China intensified, they went from guarding opera gardens and protecting folk crafts to participating in underground intelligence transmission. In the intertwining of national justice and the love between children, they composed a heart-stirring anti-Japanese love song.
