In the spy war against the Japanese aggressors, party member Xia Xiaoxue and party member national Tang Wensheng met by chance. They love each other, but they spy on each other and eventually fight to the death ... such a pair of lovers are destined to be an earth-shattering love elegy.
The Japanese aggressors were rampant, and the Xia family was massacred and saved by the mysterious elder sister. On the way to escape, she met Tang Wensheng and shared the trouble with her. Xia Xiaoxue was taken to the revolutionary base by her sister, and Tang Wensheng was sent to the military spy training camp by his uncle Tang Dinggan, where Mei Yan, a female student, had a crush on him. Half a year later, Tang Wensheng accepted his uncle's order to enter * * *, alias Shao Yan, and met Xiao Xue again. The two had feelings in the common War of Resistance against Japanese Aggression, and because of the need of the situation, the elder sister became the witness of the couple.
Shao Yan and Xiao Xue fought side by side like husband and wife against the enemy. In order to protect her sister Xiaoxu, Mei Yan married Shao Yan's uncle Tang Dinggan. Tang Dinggan had secretly defected to Japan at this time, and was dispatched by the senior intelligence official Long Ben Zhang Qian. The loss of information made Long Ben Zhang Qian very angry and sent Tang Ding to clean up the underground party.
Xiao Xue and his wife have become more and more tacit in carrying out their tasks. However, after a mission failed, Xiao Xue realized that her husband might be undercover. After a painful choice, she refused to retreat and decided to use Shao Yan's identity to seduce the enemy. Shao Yan also became increasingly suspicious of his uncle's instructions. The failure of the mission also made him suspect that Tang Dinggan had taken refuge in the Japanese, but Tang threatened Shao's mother's safety.
The husband and wife began to infighting, and it gradually became clear that Japan secretly made bacterial bombs in underground arsenals. Tang Dinggan ordered Shao Yan to kill his wife, and Xia Xiaoxue was also ordered to lift the rape. After a painful choice, the two finally decided to unite against Japan, and Xiaoxue disguised to rebel with her husband. ...
Xiao Xue accidentally discovered that Mei Yan was her long-lost half-sister! The two overcame their grievances and finally recognized each other, but they didn't know that the Japanese dragon rush was actually Mei Yan's biological father! The threat of the Japanese army's implementation of the "Dragon Plan" is growing, and time waits for no one. Mei Yan ventured to assassinate Tang Dinggan, but was brutally killed. Xiao Xue fought back her grief, pretended to be Mei Yan, gritted her teeth and recognized her father, and went into the lair of the Japanese intelligence center. And find out the basement of Japanese drug-making bacteria and send the information out in time. The Eighth Route Army attacked the city and destroyed the "Dragon". Xia Xiaoxue and Shao Yan rushed into the basement to destroy the "dragon", and this time it really became their "where are you going?" ...