1940, Nanjing. The Kuomintang's military reunification agent, Zuo Shuangtao, codenamed "Five of Hearts", participated in the operation mission. The target of this operation was Takeo Yamashita, who was a special agent of the Military Division of the Japanese Army Ministry. Takeo Yamashita has been in China for many years as a businessman, and he is very meticulous in his actions. His appearance is unknown. Yamashita Takeo intercepted a secret letter that the military commander was about to send to Shanghai. Their secret service must not be allowed to decipher the secret letter, so they must recapture the secret letter. The person in the photo is the escort of Takeo Yamashita. According to reliable information, he will escort Takeo Yamashita on the train from Nanjing to Shanghai. Zuo Shuangtao speculated that the guard's left eye was either squinted or blind, and he was fitted with a prosthetic eye.
After talking about the action plan, they started to take action. Akun knocked off the sunglasses of a man wearing sunglasses and found that the person was neither blind nor squinting. Zuo Shuangtao put down his hand and turned around when he bumped into a one-eyed dragon. He was shocked to realize that this person was the guard in the photo. Yamashita Takeo was cunning enough. In order to remain inconspicuous, he actually sat in a second-class seat. It seemed that Yamashita Takeo had more than one escort. The guard photo in Xiao Hu's pocket fell to the ground. When he went to retrieve it, he was questioned by the guard with a gun. After Xiao Hu was shot, he quickly stabbed the guard to death and snatched his wallet. People around him panicked when they heard the gunfire. Xiao Hu was subsequently killed by the gendarmerie as a thief. Zuo Shuangtao held the others back and prevented them from passing by. Once they passed, it would be a dead end.
Taihe Trading Company is the Huxi Intelligence Station of the Japanese Military Police Headquarters in Shanghai. The employee Chen Jiaping is an underground member of the Communist Party of China. He learned that Takeo Yamashita would come to Shanghai by train. After observation, Zuo Shuangtao confirmed that the person wearing a gray woolen coat in Car No. 3 was Takeo Yamashita, and there must be a secret message in the briefcase in his hand. Chen Jiaping sneaked into the trade team leader's office and wanted to open the safe. Unexpectedly, Zhao An had an affair with Luo Guanqun's wife Zhang Shuyun here, and he was forced to hide behind the curtain. Kenzo Kimura knocked on the door, and Zhao An quickly asked Zhang Shuyun to hide behind the curtain, which happened to be the other side. Zuo Shuangtao poisoned the tea cup, and Yamashita Takeo was indeed poisoned, but because the dose of poison was not enough, Yamashita Takeo did not die.
Zuo Shuangtao believed that as soon as the train arrived at the station, Yamashita Takeo would be sent to the infirmary for treatment, and then they would see another opportunity to take action. Kenzo Kimura opened the curtains and saw Zhang Shuyun. He mocked Zhao An for a few words and then got down to business, asking Zhao An to go to the station to protect Takeo Yamashita to the infirmary. The big star Han Lu once made a movie for a Japanese factory and was considered a traitor. She was almost shot dead at the station. It was Chen Jiaping who rescued her. However, Zhao An's people were alerted when they heard gunshots, and A Kun and Da Xuan took action urgently. As a result, both of them were shot. Zuo Shuangtao had to leave first, but was still discovered by Zhao An and followed closely. Zuo Shuangtao changed clothes, discarded his coat, hat and gun, and then met Chen Jiaping by chance.
Chen Jiaping said that she was his girlfriend in front of Zhao An, so Zhao An did not arrest her. Two years ago, due to the execution of a mission, Chen Jiaping missed the time to receive the certificate from Guoguo, and the two parted ways. They did not expect to reunite in this way. After making sure that no one was following them, the two of them turned left and right at the intersection. At this time, Zhao An suddenly appeared with someone in his car. Chen Jiaping immediately turned back and hugged Guoguo, but the two were still taken away for interrogation. The person who interrogated Chen Jiaping was Luo Guanqun. He and Chen Jiaping met in 1938. At that time, Chen Jiaping was following him but inadvertently blocked a shot for him, and the two became acquainted. Although it was just a formality, Luo Guanqun did not let off steam and directly asked Chen Jiaping which train his girlfriend took and what time she arrived at the train station.