The moment Tang Shaoyang heard the name, he sent a telepathic message to Origin, asking what was the relation between Kang Jiayi and Zheng Geming. There must be some sort of relationship that his father-in-law pushed the issue this far.
He soon found the reason why. Zheng Geming was Kang Jiayi's friend. In fact, Origin gave him so detailed information. More than friends, both were comrades when they were in the military. Both were Generals, and Kang Jiayi found his friend a few months later. Zheng Geming was one of many survivors who survived on their own and joined the Tang Empire later on.
He also found out that Zheng Geming tried getting into Tarrior, offering himself to immediately get promoted with his background. Of course, he was rejected and was told by Zhang Mengyao that everyone had to start from the bottom rung regardless of their background even before the Game.