Fang Zhen understood the King's intentions after reading it.
The so-called "special envoy" was actually a negotiating team, sent to represent the King and hash out a deal with Fang Zhen.
According to common practice, this kind of negotiating team would tailor their approach to the person. If they thought Fang Zhen was easy to fool, they would play up their royal authority, trying to get something from him for nothing. But if Fang Zhen proved to be a tough negotiator, they would take a different approach.
But in any case, the fact that the King hadn't explicitly opposed Fang Zhen's occupation of the Tarrenno and Balenzuo duchies was advantageous for him.
When Keton, Tahar, and the others learned this news, their morale received a significant boost.
At the very least, they no longer had to worry about the King invalidating everything Fang Zhen had built, which meant they wouldn't have to fundamentally stand against the established law and the King.
