"It's just an illusion." Xu Xingguang walked to the wall and said, "By applying a layer of special material on this wall, it creates a dull, heavy illusion when struck. Experienced secret passage designers know this."
Hearing this, Zheng Lie instinctively asked, "How does Miss Xu know?"
Silence filled the room.
Xu Xingguang smiled and said, "I am an experienced designer myself."
Zheng Lie blushed and lowered his head, choosing to remain silent.
Xu Xingguang then took out a measuring tape and re-measured the wall in front of her. She found an intersection point, then looked back at the wall behind her. She extended the tape measure outwards, and when it reached 1.2 meters, she said to Huo Wen'an, "Brother A Zui, go to the end of the tape."
Huo Wen'an walked to the end of the tape.
There was a patch of empty space, with no signs of a suspected mechanism switch.
"Squat down," Xu Xingguang instructed, "and tap the floor tiles with your hand."
"How many taps?"
