Spring 1949, Nanjing
Lin Xiaojie, the only daughter of Lin Nanxuan, a senior KMT general, was influenced by the revolutionary and progressive thoughts and joined the Communist Party. She broke off the relationship because she could not accept his identity. However, something unexpected happens at home, and Xiaojie discovers that her father is actually an old party member and an outstanding intelligence officer.
Xiaojie sneaked back to Lin's house to retrieve the information her father had sacrificed his life for, but encountered a group of Kuomintang officers and soldiers who came to search the house. However, the young officer Qiao Qifeng in charge had a unique temperament, as if a mysterious force had bewitched her.
Soon she was ordered to work as an undercover agent in Taiwan. When she arrived for the first time, she attended the Christmas ball at the house of the spy chief "Boss Dai" and unexpectedly met Qiao Qifeng. Qiao Qifeng is a charming and suave man who is the guest of Miss Dai Er. Unexpectedly, he invites Xiaojie to dance with him as soon as the show starts. Such a high-profile appearance was unexpected by Xiaojie. What was even more elusive was Qiao Qifeng's intention. Did he do it on purpose? Did he already doubt her?
She felt threatened by his charm. However, he is Miss Dai's prey and a close confidant of the Dai family. Should she keep her distance, or should she deliberately approach him?
In the whirlpool of the spy sea, she gradually lost herself...