Suddenly Appearing Writing

"Settle down, settle down! Hurry up, we have a lot to do this afternoon!"

Professor Slughorn stood at the front of the classroom, taking glass bottle after glass bottle from a wooden box and arranging them on the desk. He wore a kindly smile, his walrus-like mustache trembling faintly, his bulging beer belly stretching the buttons of his waistcoat. Whatever his usual favoritism toward good students, at least when he stood at the podium, he was a qualified professor.

In the cold, damp underground Potions classroom, the sixth-year Advanced Class students laid out their textbooks, notebooks, and essays from previous assignments on their desks.

Loren propped his head up with his left fist while leisurely opening his textbook with his right hand: Libatius Borage's Advanced Potion-Making. The notebook beside it belonged to Hermione, its handwriting neat and its contents detailed.

Glancing at the neighboring desk from the corner of his eye, he saw Harry still had that battered old Half-Blood Prince textbook in front of him. Ron was enthusiastically trying to make out the writing on it, but it was so crooked and messy that he could not decipher a single sentence even after a long while.

Ron scratched at his head, about to ask his deskmate, when Professor Slughorn opened his textbook and began the lesson.

With the sixth-years entering their second semester, the students had generally adapted to the difficulty of the Advanced Class curriculum, and the professor had fully adjusted to the teaching pace of this class. They had already reached the final section of this year's syllabus, a key topic for the Ultimate Wizard Level Exam—

Antidotes to poisons.

Slughorn swept his gaze over the students below, lingering briefly on Harry before moving on without a trace. "Today, we'll continue with Golpalott's Third Law. Do you