Yan Fei utilized the Artificial Intelligence "Dream" to surveil the entire Dream Island, but Yan Fei still played it safe, creating several surveillance blind spots in a few places that only he knew of, just in case, so that he could avoid the monitoring of Artificial Intelligence "Dream" when necessary.
Yan Fei had already noticed the subtle look in Captain China's eyes when looking at him, then Captain China deliberately paid extra attention to the surveillance equipment in the room and uttered those words, which made Yan Fei realize that Captain China must have something very important to tell him, even not wanting their conversation to be captured by the surveillance, hence he brought Captain China to this blind spot that couldn't be captured by the Surveillance Cameras.
After hearing Yan Fei's words, Captain China still seemed uneasy, he glanced around the environment again and asked, "Are you sure this place can't be listened into by any equipment?"
