Introduction: Cheng Rang, codenamed "Echo", lurks at the heart of Telecommunications Office 76.
The Japanese want to investigate him, Li Shiqun suspects him, and Chongqing is also looking for him. Hunted by three parties, his transmitter was hidden in the mezzanine of the listening room, and he was still sending reports to Yan'an every night - if he was one second late, he would be shot.
But no one knows that Cheng Rang can understand all the "subtext" in Morse code. Every encrypted telegram from the enemy is automatically translated into clear code in his mind.
Instigate a rebellion against the ace agent, intercept the top-secret rural clearing plan, and turn Radio No. 76 Into his own intelligence transmission tower. When the enemy finally locked onto the "conspirator", Cheng Rang took off his headphones and said, "Stop looking. All the secrets of No. 76 Were sent to me."
After dawn, someone saw the line at the end of the telegram, which contained only four words - Comrade, go home.
