King Cheng Lau was an Early Demi-God Realm cultivator. With his family's wealth and powerful influence within the Nine Heavens Continent, especially with the Mainland Empire, he was able to make his own independent kingdom that wasn't controlled by any empire.
Surrendering the Northern Region which was very rich in minerals and Spirit Beast was the same as giving his wealth to strangers for free.
"I don't care who or what the Emperor Ya Se is. I am not going to give my territory to just anyone. Now, leave my palace and tell your master to go fuck that Emperor Ya Se!"
King Cheng Lau raised his hands once again, this time with a fury that resembled that of a demon.
"KILL THESE BRATS. LET THE BLONDE WOMAN ALIVE!"