Bless my sight!!
"Mmm."
Muffled screams could be heard from the basement. The muffled noises were from Xin Feng, who started experimenting on his eyes to improve it faster than it would with rejuvenation.
The healing liquid could improve the entire body, but it was the area that it healed that improved the most. Cutting his finger for example, would make him stronger overall, but it was the damaged area that benefits the most. As a result, the bone and the flesh of the area that had been cut off was two to three times more durable than the other areas of his body. This meant that if making a knife wound on his finger was possible, the same spot that had been wounded before might not.
Xin Feng didn't stab both eyes simultaneously of course, because he was still vigilant enough to avoid being dysfunctional in case the healing liquid stops working. He had been stabbing his eye all day and only stopped when he needed to go to the restroom or sleep.