Although they all had entered the labyrinth before, every person has a different constitution, and the intensification and inclination of abilities differ amongst them.
Bai Youwei's hearing was nowhere near as sharp as Shen Mo's.
It could also be due to the fact that her ears were filled with the sorrowful sound of singing opera, making it impossible for her to hear other sounds.
After Shen Mo's warning, Du Lai also noticed the disturbance.
"Did someone just open a door?" Du Lai suspiciously walked to the window, leaned close to listen again, and said, "Everyone closes their doors after dark, why would there be a sound of opening a door? I'll go and see what's going on."
The Li family and Liu family were neighbors, separated only by a garden wall. If one could climb over the wall, it would be possible to see the situation next door without leaving the premises.
Fu Miaoxue immediately clung to Du Lai, sobbing and refusing to let him go.