The unit of the Anti-Japanese Allied Forces fighter Pang Tiande (played by Zhu Yawen) was frantically encircled and suppressed by the Japanese Kwantung Army, and had to temporarily withdraw to the Soviet Union. The Soviet side arranged Natasha (played by Eliza) to be responsible for the intelligence training of Chinese soldiers. She admired the smart and handsome Tiande very much, and the two had a deep love. After the training, the two were sent to the territory to meet with the underground party. They successfully burned down the Japanese dock, executed the Soviet scum Rostov (played by Andrei Lazev), and collected a lot of detailed intelligence for the Soviet side. Subsequently, Natasha was recalled to the country. Tiande refused the marriage arranged by his father (played by Ma Enran) for him, just wanting to reunite with Natasha as soon as possible. After the founding of New China, Natasha came to China as a Soviet expert. When the two were about to register for marriage, Sino-Soviet relations broke down, and the two were separated from each other. After the reform and opening up, Tiande remembered the promise of the year and met Natasha, who had been dreaming for decades, at the Sino-Russian border...