Using the cover of Mudanjiang Datong Hospital, a secret international traffic liaison station was established, with Ding, a member of Pioneer Team, as the hospital director. The old postman became a single-line contact. The Japanese army has the information of the advance team, and the medical team is suspected. Fujian and Dagna were sent to the medical team to monitor the movement of the team members. Gao Jian got in touch with party member intelligence officer Dagna. Dagna and the director of the Japanese Army Secret Service, Nobuyuki Iimura, meet to play a double agent.
Bo Xiang took refuge in Japan and became a member of the other shore flower. Fancun asked Liu Wenqing and Su, the paixiang school, to go into Suifenhe to find out the news. Gao Jian used rich women to send messages to white shopkeepers. The head of Yitian Brigade arrested people in Hailangtun and negotiated with the anti-Japanese Coalition forces to exchange prisoners of war. The rich woman can't stand deliberately revealing secrets. After the local fishermen were treated by the medical team, they sent the information to Zhang. It is extremely fierce to stop the Japanese army at Zhujiadukou in Mudanjiang. Knowing that the allied forces were short of ammunition, they secretly met with the commander of the allied forces, Wang and Brigadier Zhang, to actively raise funds and publicize the anti-Japanese war. The soldiers disguised themselves as fishermen and secretly placed explosives to stop the Japanese from crossing the river.
Gao Jian and Hao Dashuang got in touch with the shopkeeper in Hotan, made a detour in Yitian, and initially woven a traffic network in Jidong, and the Northeast Anti-Japanese Coalition was declared. Gao Jian got in touch with Dagna when he ambushed the rebels in Muling jungle, and Dagna took the opportunity to show his love to Gao Jian. Gao Jian met with Taoist Yuchang and resumed the work of Taoist liaison station. Gao Jian crossed the border and met General Vitaly of the Soviet Far East Intelligence Agency, and handed him the underground traffic contact map. General Vitaly agreed to support him. The Japanese army is increasingly suspicious of Gao Jian, and Gao Jian responds with wit. Dagna confirmed Bo Xiang's membership in China, and got Gao Jian's love. Gaojian Station was in distress, and Dagna cleared it in time. And cover Gao Jian to convey important documents to local party organizations. Iimura began to distrust Dagna.
The anti-Japanese Coalition forces are growing, and Japanese spies are crazy. The old postman got three radio stations, which were successfully brought into China with the help of Song Dahua and Xiao Changshan. Lan Yingsen sent Su to Mudanjiang to find Su Wan to learn more about the medical team. Iimura let the spy chakra know about the entry of the radio station and stepped up the search. Party member, a native of Jiangsu and Anhui, was exposed for not cooperating with the traitor's brother. Harbin, Mudanjiang, Suifenhe and overseas Soviet troops have established invisible power grids and fronts.
Iimura persuaded him to get married in an attempt to destroy the relationship between Gao and Dagna, and attempted to create a murder case at the wedding to uncover the mystery of the advance team. Japanese-made party member Hashimoto informed Dagna in time. Gao Jian and Dagna persuaded Su Wan to agree to a fake marriage. When taking pictures in the photo studio, the instructions were passed to the white shopkeeper, and the enemy was puzzled by the intercepted secret letter. At the wedding, Dagna watched a couple cry. After a long talk all night, Gao Jian finished the work of getting through Jiangsu and Anhui.
In a secret letter from Iimura to Lan Yingsen, Bo Xiang was asked to provide false information to Gruu in the medical team. Varoga and Najia didn't know that they had come to Suifenhe. Gao Jian and Hao Dashuang destroyed Lan Yingsen's plan and protected Varoga and Najia before Su Jin and Liu Wenqing. Liu Wenqing confirmed his identity and sent a message to Gao Jian together with Su Wan. Bo Xiang asked Liu Wenqing to prove that Najia was a member of Gruu, but Liu Wenqing refused. Su Jin found the file that recorded Dean Ding's real name and photo. In order to prove his identity, Su Wan's persuasion was invalid. Dean Ding took care of the overall situation, saved himself, sacrificed himself and admitted his true identity.
Visit Dean Ding. After listening to their conversation, Iimura Rang and Ding took the opportunity to clear Gao's identity, but refused the rescue plan. Ding was unyielding under torture, strangled three tails with handcuffs and was seriously injured. In the end, Gao Jian was successfully rescued and saved the day.
Bo Xiang and Su Jin made contributions, eager to catch two Gruwu, but they didn't do so. Fujian executed Bo Xiang with a dug trap and got photos. Bo Xiang mysteriously disappeared, and Gao Jian decided to make a fuss about the photos sent to Dagna. Varoga and Najia were safely sent back to the Soviet Union by the old postman and others.
Detected the signal of Guandi Temple and arrested Feng Deyi, two lunatics. Lan Yingsen used cow dung to test whether he was really crazy. Two crazy people ate cow dung. Su Jin tried to find out about Yu Yichang, but found nothing. Yu Yichang was detained. Gao Jian designed to rescue Yu Yichang. Dagna took out the photos processed by "head-changing" and led Gruwu's suspicion to Bo Xiang.
Gao Jian and Su Wan got the Japanese drawings, which were discovered and arrested by the Japanese. Dagna actively tried to rescue them. Su Jin also actively rescued his sister, and they put the suspect on Bo Xiang. Hashimoto pretended to buy medicine and send messages. Fujian admitted that he was a member of the anti-war alliance, and he and Dagna decided to assassinate and save people if necessary. Su Wan was tortured, but the enemy still got nothing. Gao Jian and Su Wan were finally released.
Soviet foreign intelligence agencies received information from the old postman and began to investigate the Grueney. Su Jin discovered the secret of Guandi Temple, and Yu Yi exposed it for a long time. At the decisive moment, Liu Wenqing died, and Su Wan personally killed Su Jin. Gao Jian, who was seriously injured, was greeted by the Soviet Union and was ordered to return to Moscow with Su Wan to accept a new task. Dagna lurked successfully and stayed in Suifenhe to work with Hashimoto and Fujian.