Sardeem being Manison's subordinate was a piece of intelligence that Han Xiao did not expect to obtain. In his previous life, Sardeem had not been considered a known NPC to the players and had no mission to trigger. He did not think that Sardeem was hiding this much.
Manison was an extremely strong guy. As a member of The Ancient Ones, he created his own faction in the Calamity of the Supers version.
Han Xiao was very sensitive to anything related to Manison and did not want to have anything to do with him. This was because of Aroshia.
She was a survivor of an artificial intelligence civilization conquered by Manison, and Risda was still hoping that Han Xiao could avenge them. Han Xiao still had the [Reboot] mission on his interface.