C69 Zheng Lei to Lecture?

"Big brother, how do I use this thing?" Hu Wan's personality was pure and quickly changed between joy and anger.

Zheng Lei was proud as he placed his hand on his bag of holding. With a flick of his mind, the contribution point ruler appeared in his hand.

Hu Wan looked at Zheng Lei in surprise. She looked back and forth at her bag of holding and asked, "Big brother