Right Hand of the State was actually personally coming forward to take care of Young Master Kim, and his recovery was a piece of extremely big news.
At the same time, it was an even bigger conspiracy for the Kim Family's expert who had never thought that the Right Hand would be hiding in the shadows at such a time.
This clearly demonstrated that he had not just been notified of the news, but that he had actually known about this long before.
Furthermore, who would be able to actually have the Right Hand of the state make a move personally and in such a fashion.
There were two possibilities, either he was the father of that bastard, or he worked for the guy. the only person to whom the Right Hand answered was the Grand Marshall or his family.
Since the Grand Marshall was a few centuries oldy, it didn't really strike much of a chance for him to be the bastard's father, leaving only his son.