C722 The Way to Increase One's Rank

"Not bad, not bad at all!" Yu Changkong didn't mind his clothes being torn apart by Ning Xiao. He put his hands on his waist and laughed with satisfaction.

"Teacher, are you mocking me? I have used all my strength. But I can't even leave a mark on you! " Ning Xiao smiled bitterly, "What's so good about that?"

"Nonsense. If your attack can leave a mark on me. .