Ye Xinyan expressed regret for Zheng Pengfei's skill: she couldn't learn it, nor could she see it.
Helplessly, she concluded that Zheng Pengfei was somewhat like a modern-day undercover detective, someone who could spot something unusual in the travelers' gaits or eyes in a waiting hall, stop them to investigate, and discover drugs or someone else's suitcase and bag in their possession... and so on.
If you put an ordinary person in a waiting hall to patrol, naturally they wouldn't see anything.
Obviously, she was that kind of ordinary person who couldn't see anything, while Zheng Pengfei possessed the special skill of Fiery Eyes, an undercover detective.
At this moment, Ye Xinyan and Zheng Pengfei stood on one side of the construction railway, their gaze scanning over the busy workers and the constantly patrolling master craftsmen among them.