Chen Yin, a master of Chinese martial arts who hides in the city, possesses the unique skill of "listening to the bridge". He can listen to the wind, distinguish bones, and understand the flow of energy in all things. A bizarre serial murder case specializing in human joints forced him to reunite with Lin Wan, the deputy captain of criminal investigation and his predecessor. Ten years of misunderstandings have not been resolved, and grievances have arisen again. The precise grid of modern criminal investigation collides violently with the shadowy world of traditional martial arts. When Chen Yin "hears" the punches of his old enemy from the scars on the corpse, and discerns the rhythm of murderous intent from the noise of the city, he must clench his fists again, not only to pursue the truth, but also to protect the old relationship that has never been let go. This is a reasoning completed with the sense of muscles and bones, a chivalry realized in the fireworks of the world.
