Chuzheng flips through the book noisily, but aside from proving it is a version from 2019, there's nothing useful.
Chuzheng fiddles with it for a long time and still can't find anything of use.
Before going to bed at night, Chuzheng puts the book back in its original spot, but the next day it's gone.
The window and door are both shut tight, with no sign of anyone entering.
Chuzheng stands in front of the mirror, staring at the person inside, remaining still for a long time.
On the third day, nothing unusual happens.
On the fourth day, nothing unusual happens.
...
On the fifth day, Chuzheng finds an extra bag of cotton swabs and a bottle of disinfecting alcohol on the table.
Chuzheng installs a surveillance system in the room and puts the items back away.
However, the next day when she wakes up, the items are still there.
Several days in a row, the items don't disappear.
