After thorough investigation by the Royal Guards, it is found that the person who really sold the design of Tianlei is Shi Wencheng, the left servant in charge of the manufacturing department of the Ministry of War. Under the torture, he also confessed that he had been bought by the Tatar's careful work five years ago. This time, the other party forced him to give the design. Of course, the other party didn't take it for nothing, and gave him a reward of 50000 silver.
Selling such an important secret of the state, Shi Wencheng's fate is naturally to steal the family and destroy the family. But Li Mian was not satisfied with the result. He said to Zhong Qinbo, "Dad, why don't you investigate thoroughly? I don't believe that Tatars bought Shi Wencheng."
Check along this line first, and it can involve a big