1942: Operation Nightingale

In 2025, Chen Hui, a clerk in the archives of the Security Bureau, was sorting through a yellowed file of the Jinmen Shouyi League in 1942. Due to a sudden circuit failure, he accidentally traveled back to the war-torn 1942 - a troubled time when the Japanese army ravaged Tianjin, the puppet regime aided the evil, and the Shouyi League fought hard. After traveling through time, Chen Hui, wearing a European-style dress and carrying the iconic pocket watch of a secret service clerk of the Japanese Army, happened to be in the old city of Xiguan after being bombed by the Japanese Army. Relying on the intelligence literacy and adaptability accumulated through her work in the Security Bureau, she quickly disguised herself as Su Wan, a Western expatriate, and lied about defecting to her uncle who worked in the Japanese Army's secret service, temporarily evading the interrogation of the Japanese Army patrol team. Knowing that survival in troubled times is not easy, and in order to uncover the truth about the attack on the Shouyi League's contact point in the files, Chen Hui determined to lurk in the Japanese Army's secret service in Tianjin and contribute to the cause of fighting the enemy. She found Lu Yan, a core member of the Jinmen Transportation Station of the Shouyi Alliance, and after expressing her feelings, she decided on the codename "Nightingale" and agreed to use the Nightingale mark as a safety mark for operations and intelligence transmission. With the assistance of Lu Yan, Chen Hui perfected her identity, forged documents, and received intensive training in French etiquette and secret service office procedures. With her fluent French and natural disguise, she successfully passed the trials of the Japanese Army's secret service chief and successfully joined the clerk's office. While carefully collecting the core intelligence of the Japanese army, he waited for an opportunity to assassinate the leaders of the Japanese army and the puppet army. She works step by step, surrounded by dangers, uses wisdom and courage to shuttle through troubled times, uses the name "Nightingale" to convey hope in the darkness, and writes a thrilling hidden legend.