Under Yu Hong's conscious control.
Soon, black lines flowed out and merged into the purifier.
The voice of Black Mark inquired, and he quickly confirmed with certainty.
Hiss...
The countdown emerged.
'3 days, 8 hours, 09 minutes.'
Three days?
Yu Hong breathed a sigh of relief.
'That's acceptable, I can live with that.'
He coughed softly, released his hand, went up to the first floor, found a breathing valve helmet, and put it on to breathe with its aid.
After a while, his coughing significantly lessened.
'The air really is problematic...'
Having fully confirmed the enhancement time for the air purifier, according to his previous judgment, if Black Mark could enhance it, it meant this problem could be solved.
Yu Hong then left the cave and headed to the inner courtyard.
In the inner courtyard, everyone had already ceased activities outside, entering the new stone castle to work within its walls.
