The reason these Guard Squad members had not been controlled by the monsters' Illusion Technique was partly because when Ye Liuyun established the camp, he had set aside a separate area for the families of his Guard Squad, perhaps due to the collective dormitories constructed there. The houses were not as widely spaced as in the villa district, which is why they had not become targets of those monsters' attacks.
Moreover, before Ye Liuyun left, he had instructed the Guard Squad that members must move in groups of three or more when going outside, so until now, no one had been controlled by those monsters.
After confirming the loyalty of his Guard Squad members, Ye Liuyun led everyone to begin an inspection check starting from the villa district. When the other residents saw Ye Liuyun and his group barging into their homes, they were initially angry. But after listening to Ye Liuyun's explanation, whether they believed it or not, they all ultimately accepted the inspection.