C393 success of cure

Immersed in the unraveled world, Ling Xiao didn't even notice the passage of time.

Following a sharp and clear knock on the door, Ling Xiao was pulled back to reality from his thoughts.

It was rare for Ling Xiao to be this focused, because he would rarely encounter such a difficult problem. Most importantly, Ling Xiao discovered that this manual was extremely useful for his own training