Paramount singer Yun Shu was recruited by military commander Gu Mingyuan, who used the rhythm of her singing to convey information; her first mission was successful but aroused suspicion from the Japanese army; the two secretly fell in love while working together, but secrets were leaked from within the military commander, and Gu Mingyuan was transferred; Yun Shu realized that she was being watched, and Gu Ming After Yuan's confrontation, they jointly found out the mole; their relationship heated up during the escape, and Gu Mingyuan was seriously injured and lost his memory in order to protect Yun Shu; Yun Shu awakened his memory with singing, and jointly exposed the treason of Chongqing's top officials; in the end, Gu Mingyuan died, and Yun Shu defected to Yan'an with the evidence, and the singing code became an eternal belief
