Zhang Mengyao came down and inspected the wall from a distance. The black steel wall was perfectly made. It was not patching the wall, it was a straight smooth wall. It was clearly not human-made.
The wall was five meters tall, spreading wide through the building. She quickly noticed this might be the work of the system.
'But why? How?' She was puzzled by the sudden appearance of the wall.
"What is this?" She heard Tang Shaoyang's voice from the back.
"I don't know," Zhang Mengyao shook her head, "But there's a gate there! We can try knock to find out," She pointed at the gate. Clearly, the gate was made on top of the road so the car could pass through easily.
The wall was created by the system, but it was placed or positioned by a person hence it was designated the gate on top of the road. Zhang Mengyao deducted the whole thing by just looking at this.