Li Mu couldn't tell where the crux of the problem was.

Qing Feng's current state and the running of his natural qi were normal.

"Is it have something to do with his constitution?"

Li Mu could only guess so.

"I want to tell you another thing."

Li Mu took out the bottle given to him by the Sword Savant, which contained two Darkest Soul-devouring Fires.

He prepared them for Qing Feng and Ming ...