Cadin is a beacon student, beacon is a school that train huntsmen and huntresses to kill grimm, grimm are monster who attack humanity when they feel some emotion
One day, after beacon ball, cadin needed to go to the school library, he looked at the book when he found one nammed 'the reality book', curious cadin took it before go to a table and open it. he looked at the book and noticed than all the page weren't written, exept the first, the only thing that was written was 'whoever have this book, what you will write in it will became a reality' cadin laugh not buying it at all, cadin know if it was true, he would only use it for his selfish desire.
Cadin then choose to write one thing 'jaune has never been accepted in beacon', he write it with a smirk on his face thinking than if this book really have these power, then jaune wouldn't be here. Then cadin leave with the reality book
The next day in class time, the teacher Mrs goodwitch is teaching about the history of remnent, but then cadin noticed jaune isn't here, his eye widen as he realize the power he just had with this book.