Tan Rou and the others were on the top floor. When the entire building was renovated, the top floor would usually be renovated first to prevent the construction waste left behind from polluting the other floors.
Tan Rou walked along the corridor. Whenever she walked into a room, she would go in and take a look. Then, she would use the screwdriver she brought with her to shovel the dust off the wall and try to see if the Screwdriver could poke through a wall. If she could poke through it, it meant that there was something wrong with this wall as well.
Along the way, Tan Rou realized that there was something wrong with the walls of every room. If they were to use this building in the future, it would collapse one day.
This was really too dangerous. If not handled properly, someone might die.
