Spy 1937: the Lights Come On

Lin Yuan, a doctor of modern military history, traveled to Shanghai in 1937 on the eve of the Battle of Songhu. Relying on the intelligence analysis ability that transcends the times and the prediction of the direction of history, he has been dealing with the four forces of the military command, the Central Command, the Japanese military special high school, and the underground party of the Communist Party of China. He has gradually grown from a small telegraph operator to a top double agent codenamed "Dark Arrow". At the same time, he has a deep love with Su Wanqing, who appears to be a socialite but is actually an underground party member.