Yun Jinxiu is the top singer of Paramount and a lurking assassin of the military command, codenamed Nightingale; her mission is to get close to the young marshal Gu Beichen, waiting for an opportunity to assassinate and open a gap for revenge; Gu Beichen is the youngest heir of the Beicheng warlord. On the surface, he is very romantic, but in fact he is very deep in the city. He has long recognized Yun Jinxiu as the little girl he saved eight years ago, but he remained calm; for the first time in close contact, Yun Jinxiu poisoned the wine, but was Gu Beichen cleverly avoided it by giving her a pearl necklace; Gu Beichen began to order her frequently, and every time he ordered "Tuberose", which was the song Bai Yueguang sang in his memory; Yun Jinxiu found that she could not kill him because he had been secretly protected by him many times in life and death situations; under pressure from the top military leaders, Yun Jinxiu was forced to choose to blow up the stage trap at Gu Beichen's birthday party; Gu Beichen deliberately dismissed her that night, She was injured, but she tied Yun Jinxiu to her side as her personal secretary; the two spent day and night together in the villa, and Yun Jinxiu discovered that in Gu Beichen's study there was an old handkerchief she had embroidered ten years ago; it turned out that Gu Beichen had been looking for her for eight years, and Bai Yueguang was herself, but Yun Jinxiu had become a pawn of the military; Gu Beichen's adjutant was a Japanese spy, secretly inciting a vendetta between the two sides; Yun Jinxiu was accidentally arrested during a mission, and Gu Beichen used half of it The army exchanged her life, but the military commander used this to threaten her to go back and continue undercover; Yun Jinxiu became pregnant, Gu Beichen proposed to her, and she was forced to hide poison in the ring on the wedding night; finally she chose to confess everything, and Gu Beichen told her that he had known she was an assassin and had been waiting for her to turn back all these years; the two teamed up to kill the adjutant and the military commander's traitor, but were ambushed on the eve of the Northern Expedition; Yun Jinxiu was shot to save Gu Beichen and lost her memory for three years.
