In 1940, Tang Zhonglin, who was an instructor of our party's cadres, was appointed by the organization to replace his biological brother Tang Bolin, who was assassinated as a traitor. He infiltrated the Peking secret service to obtain the list of 70 enemy agents lurking in our party. The mysterious person "Zhi Yuan" has been providing intelligence to our party. Tang Zhonglin also discovered that all of this, including his replacement of Tang Bolin, was planned by Tang Bolin in advance. After completing the mission in Peiping, Tang Zhonglin had to return to Shanghai No. 76 And continue to disguise himself as Tang Bolin to deal with enemy agents... During the investigation, Tang Zhonglin gradually revealed the true identity of Zhi Yuan, and at the same time pieced together a more realistic Tang Bolin...
