Zheng Chaoyang Bai Ling dressed as husband and wife to catch Lao Huang Shang Chunzhi poisoned Qin Zhaoyi. Bai Ling learned from the sentinel’s test results that they were poisoned in the United States. The poison was the same as the poison on the rope at the water pipe interface. Zheng Chaoyang thought that Lao Huang couldn’t get rid of his relationship, so he interrogated Zilala again. Hao Pingchuan went to take Qi Lala for interrogation, but was running into Qi Lala to run away.

Lao Huang returned to KMT spy Shang Chunzhi, and Shang Chunzhi knew that he had been exposed, so he rushed to the Black Forest to transfer the munitions, and exploded the arsenal if something unexpected happened. Zheng Chaoyang no longer doubted Qi Lala, but still shut him up to hide his eyes and ears.

Zheng Chaoyang and Bai Ling posing as a couple who want to buy a house, they want to buy the house rented by Lao Huang. Old Huang saw that Zheng Chaoyang and Bai Ling were not right to buy a house, so he kept his hands in his pockets. Zheng Chaoyang and Bai Ling saw that Lao Huang had a gun, so they pretended to leave, and at the door, while Lao Huang was not paying attention to subdue him, Bai Ling hurriedly called Hao Pingchuan and others. Lao Huang saw that he could not escape, so he bit the poison in his mouth and committed suicide.

Hao Pingchuan searched a radio station from the old yellow house. Zheng Chaoyang found the burned note in the ashtray. Bai Ling saw the ashes, so she used the knowledge learned from the Soviet Union and used the method of fire to see the words Black Forest. Zheng Chaoyang learned that Qi Lala had many old maps, so he brought Bai Ling and Hao Pingchuan to Qi Lala’s house.

Several people from Zheng Chaoyang finally found on the map that the location of the Black Forest is the current Dahugou in Baoding, where the Japanese army’s arsenal was used, and they learned that the head of the spy was a person named Shang Chunzhi. Finally, all agents in the Black Forest’s arsenal were eliminated.

Qin Zhaoyi hurried to spread news to Shang Chunzhi. Shang Chunzhi claimed that today was Qin Zhaoyi’s birthday. Then he took out a bowl of poisoned longevity noodles and poisoned Qin Zhaoyi. Shang Chunzhi wore the orchid ring on Qin Zhaoyi’s hand, and the agent’s certificate was also placed on Qin Zhaoyi’s body. Shang Chunzhi was subsequently renamed Qin Zhaodi.

The soldier found Qin Zhaodi’s body. Hao Pingchuan looked at the deceased and believed that the deceased was a special agent, Shang Chunzhi, but Bai Ling and Zheng Chaoyang felt that she could not be identified as Shang Chunzhi from the ID and the ring. She did not match, and the dead man’s nails were covered with dirt.

On January 21, 1949, the People’s Liberation Army entered Beiping, and the Kuomintang troops withdrew completely. Zheng Chaoyang, Bai Ling and other trainees went to Peiping police station to serve. Seeing that everyone is about to separate, everyone is very reluctant. Zheng Chaoyang proposed to meet once a year in the future, and it is scheduled to report to Huangni Village.

At the same time, Qin Zhaoxuan got a carriage to Peiping, lying on the road, claiming to go to his second uncle, and inquiring about the situation in Peiping. Zheng Chaoyang and Hao Pingchuan came to Peiping police to handle the transfer. The former KMT chief Xu Hancheng nodded and led all the police officers to greet him.