In the Battle of Wuhan in 1938, the war enveloped the three towns. {Su Jinli}, a student from a church school, was accidentally selected by Shen Yanzhi, an underground party intelligence agent disguised as a businessman, to become a secret intelligence transmitter because of her extraordinary ability to remember things. The cheongsam wrapped around her body concealed passwords, and the rickshaw tracks marked the route. She drew the Japanese army's defense map from memory, sent encrypted telegrams, and traveled between the concession and the chamber of commerce. Japanese and puppet spy Matsui Kenichi has a sense of smell like a wolf and chases and intercepts her several times. She and Shen Yanzhi cover each other in a hail of bullets and develop feelings in troubled times. From the calm classrooms of missionary schools to the war-torn streets, they used youth as a blade and deep love as a shield. Finally, at the critical juncture of the Wuhan battle, they delivered intelligence to our military positions and protected their homeland and country from danger. After the war, the smoke still lingered, and he held her hand and said, "Everything is fine, let's spend the rest of our lives together."