Qiubai lurked as a Japanese translator, using the espionage system to continuously improve his disguise ability and intelligence acquisition skills. In the early stage, he stole the Japanese army's combat plans and foiled multiple raids; in the middle stage, he discovered that his separated sister was controlled by the Japanese army and became a comfort woman, facing the torn apart of family ties and mission; in the climax stage, he had to choose between protecting the underground party organization and saving his sister. In the end, at the expense of his sister, he successfully sabotaged the germ warfare plan of Unit 731 and stole the scorched earth combat plan before the Japanese surrender. At the end, his identity is exposed, and he completes the last intelligence transmission in a life-and-death pursuit. Life or death is uncertain.
