chapter 75 It's almost done, you!

After a while, an order finally came from inside the door, with a slight sigh, "No, start again."

Seraphina looked around awkwardly. If there were desks at the front and back desks for her to copy this in the high school classroom, what would happen if she was the only student now... I vaguely remember that the number of knocks twice is different, three taels? Or two or three? The Seraphina classmate bit the bullet and knocked again, his hands hurt a little... This door is really...