The story takes place during the Anti-Japanese War. The Japanese army launched a corrosive offensive from the inside out in China. During the various stages during which the Kuomintang and the Communist Party turned from confrontation to cooperation and then to civil war, they never gave up any struggle. Even if they were dying, they persisted until the last "bullet" - this "bullet" that was regarded as embedded in China's life like white blood cells was Yin Yemei, the adopted daughter of the chief president of Fangxin Bank Shanghai Branch.
The story begins when Yin Yemei is 13 years old. Her childhood sweetheart Shang Mi joined the secret organization of the Kuomintang while studying abroad. After returning to China, she used the identity of a prodigal son to cover up her secret actions while looking for more opportunities to save the country and the people. Shang Mi falls in love with Miao Ying, the mainstay of the Shanghai Song and Dance Hall. In fact, they are both using their ambiguous relationship with each other to protect their secret identities.
Yin Yemei was converted from a Kuomintang agent to a Communist agent. She was only 17 years old when she was secretly found by the Japanese secret service and told that her true identity was the princess of the Japanese imperial family. At that time, she was already a very good agent, but she did not know what kind of identity she should use to face herself. In the end, at the last moment when the Japanese secret service was about to surrender, a secret plan was handed over to Meizi. This was also the last fight of the entire Japanese empire. However, it was here that Meizi was entangled. What kind of decision would this young life, a girl of Japanese descent and Chinese relatives, make between nations?