After Cheng Yanqiu, the new Lianghuai Salt Transport Envoy, took office, he discovered that the salt secret code had been deciphered by the private salt network. He remained calm, embedded a silver code that was difficult to discern with the naked eye on the edge of the bait, and waited for the fish to bite the hook. Three months later, a batch of counterfeit salt caused alarm and traces of silver threads appeared, and a huge network of illegal salt sales in seven provinces surfaced. Cheng Yanqiu held a mirror as a blade and launched a life-and-death game on the turbulent salt battlefield.
