C420 Personalized

Eh!

Just as Yang Huang was about to leave in disappointment, he suddenly realized that there was a black object at the bottom of the bookshelf. Through the thick dust, he could vaguely see the traces of a piece of paper.

Since he couldn't find anything on it, then...

Taking a few steps to the last empty bookshelf, Yang Huang bent down and picked up the black object.

It was light as a feather