It was your sixth year of study. you were in the same course with Harry, Hermione, Ron and other students from different houses.

After dinner in the great hall, Dumbledore announced the new potions teacher, Horace Slughorn. You decided to devote your free morning to potions, and when you came to class, you took one remaining battered textbook.

When you opened the cover, you saw the inscription: The Half-Blood Prince's property. You did not pay attention to this, and stood next to the rest of the students.

Horace, after giving you a lecture on various potions, came up with an explanation about Felix Felicis. Having given you tasks, you each went to your own cauldron, and so did you.