Since the enemies' goal was him, Han Xiao felt that they should have measures to confirm his return. The most likely one would be to have someone watching him in Black Star City, as the Planet Aquamarine people would have no way to discover the enemies. As a Calamity Grade, toying with a surface civilization was as easy as eating and drinking.
With the investment from galactic financial groups, Planet Aquamarine was developing rapidly toward the interstellar era. In just a few years' time, they might be able to build stable interstellar carriers, colonize other unpopulated planets, and other things. However, Planet Aquamarine was still considered a surface civilization at the moment; they had no chance against a Calamity Grade Super.
