Since it was an empty promise that yielded a real result, it meant that in the eyes of Fuyu and the Three Hann States, this promise was achievable.
And considering the comparative strength between Yuan Tan and Fuyu and the Three Hann States, for Fuyu and the Three Hann States to believe that the promise could be fulfilled, there could only be one explanation: Fuyu and the Three Hann States had already colluded with the Xianbei.
Only then could Fuyu and the Three Hann States reach an agreement with Yuan Tan, and what Yuan Tan promised that would make Fuyu and the Three Hann States believe they could obtain something while Yuan Tan was fighting fiercely with the Xianbei, with a bit of thought, it becomes clear.
Considering all factors, it can't be too far, can't be too difficult to attack, and it can't belong to Yuan Tan, removing it would still benefit Yuan Tan. Besides the already fallen Gongsun Yuan in Youzhou, even thinking with one's toes, it's obvious—it's the Tian Family!
