As Yu Hong's consciousness took control,
quickly, the black line flowed out and entered the purifier.
The questioning voice of the Black Mark rang out, and he promptly confirmed it.
Sss...
A countdown emerged.
"3 days 8 hours 09 minutes."
Three days?
Yu Hong sighed in relief.
*"Not bad, it's acceptable."*
He coughed softly, let go of the handle, went up to the first floor, and found a breathing valve helmet to wear, using the valve to help him breathe.
After a while, his coughing noticeably lessened.
*"It's indeed the air that's problematic..."*
Having confirmed the enhancement time for the air purifier, according to previous judgments, the fact that the Black Mark could enhance it meant this problem could be solved.
Yu Hong decided to exit the cave and went to the inner courtyard.
In the inner courtyard, everyone was no longer active outside and had all entered the new stone castle to work inside.
