Blind guqin master Xu Henian makes a living by tuning, but in fact, he uses the vibrating frequency of the strings to transmit Morse code to the tissue.
Wang Puppet Secret Service Chief Lou Jinting loved the guqin and hid the intercepted code book in the belly of the Ming Dynasty guqin "Jiaowei". Xu Henian received the order: destroy the piano and retrieve the code within three days. But he discovered that the body of the piano contained the coordinates of the Japanese poison gas factory - information more deadly than the code book. He decided to take a gamble: Use a broken string to fake the cracking of the piano body, and let Lou Jinting drop the piano himself.
At the moment when the burnt tail fell to the ground and the mezzanine drawings emerged, he heard Lou Jinting's Browning pressing on the back of his neck.
