C66 Like Young Teeth

Knock, knock, knock.

"Come in. "

Nan Xiaoke pushed the door open and entered Ye Qiao's study. Seeing him busy arranging the books on the shelf, she did not dare to disturb him. She carefully walked to his side with the back of her hand behind her back and tiptoed to look at the books on the shelf.

The black and blue book covers were neatly placed on the shelf. Among them