The story of a pair of twin sisters (Lan Xi decoration) at the expense of their parents in the war, and by the crowd dispersed, were two of families have grown up. Respectively, have a good education in the two family, but he believed in communism, loyal to the Kuomintang side. After growing up, as the party's sister Lin Changying (Lan Xi ornaments) as alternative to sister Su Shaoqing (Lan Xi divides the decoration), in the Communist Party organization help as the Kuomintang baomiju positions, and meritorious service award.
In the moment, sister Langbei escape jail, he appeared in front of the Kuomintang officials, an authenticating Su director staged farce! Security Bureau Director Ye Gongjin (Gong Hanlin ornaments) in order to maintain face, find the Communist behind the big fish, even beat him at his own game, released the two sisters, secretly let two people fight each other, want to do profit at other's expense. But they did not want to, my party workers are using the balance of forces on the tip of my party information, protects the job is important one annulus, passing continuously from the top military vital intelligence.
Graceful bearing of Du Ziyuan (Guo Jiaming) and sister Lin Changying (Lan Xi ornaments) from childhood sweetheart, after the war and our party had lost for many years after the mission, Du Ziyuan again and favored childhood "Lin Changying" meet, does not know that she is Lin Changying's twin sister Su Shaoqing (LAN Xi decoration). To find this person is not that person, Du Ziyuan and Su Shaoqing have to start a new love affair.