Wei Cheng never underestimated the Alien demons.
So, when he heard from Qi Mei after the forced merger of the regions, that the Demon Army in Tian'nan County City were hiding their main forces within the city, laying low and not venturing out, he grew suspicious.
He couldn't dismiss Qi Mei's information as incorrect - after all, she was P11 Legion's top assassin + thief + ranger!
So, four days prior, he semi-jokingly mentioned he wanted to visit Tian'nan County City personally to investigate, hoping to spot anything peculiar.
After all, due to the Spiritual Wine mission, his relations with Cangwu City's other allies were strained, and the Cultivation Alliance assembled by Thousand Mechanism Hall had graciously decided not to break off relations completely and attack them.
So, if any trouble were to befall Cangwu City in the future, he couldn't count on even a single support army to come.