In Shanghai during the Republic of China, the heroine Su Manqing was a famous cheongsam designer. Her cheongsam was not only beautiful, but could also hide information. The male patron Gu Yanzhi is a member of the underground party. He often uses customized cheongsam as an excuse to obtain information from Su Manqing. Su Manqing gradually discovered Gu Yanzhi's identity. Not only was she not afraid, she also took the initiative to help him pass on more important information. Under the investigation of the Japanese army and spies, the two supported each other, used their cheongsam and courage to protect their home and country, and also developed a deep love in troubled times.
