The plot of the TV series Silence tells the story of Ma Dong, a national security policeman, hiding his identity and lurking in the military factory. In order to investigate international leaks, he cooperated with the national security department as an ordinary security officer and finally found out the story of international spies.

In the play, Ma Dong is played by Hu Jun. Because of his quick thinking, vigorous skill, natural and unrestrained personality and strong adaptability, he was chosen to sneak into the No.202 factory of the National Army as an undercover.

After entering the 202 factory, Xu secretly investigated the truth about the leakage of confidential raw materials. Foreign spies discovered their identity and the two sides had a contest. During this period, Xu met his good friend Chen Qigan, but both of them fell in love with the heroine Feng, because they were undercover and would die at any time. Coupled with brotherhood, Xu had to reluctantly give up what one favours.

In the past 25 years, in the face of affection, love and national interests, he has been caught in difficult choices again and again.

Feng is the daughter of Feng Jingnian, chief engineer of 202 Factory. The person she likes is actually Ma Dong.