There are only six Hufflepuffs left in the castle over the winter holiday. Naturally, Daehyun decides a sleepover in the common room is in order.

Youngjae tries to revise. Daehyun makes it his life’s ambition to break every unspoken library rule possible.

Youngjae is not happy at all when Daehyun receives a funny old letter inviting him to a special school for witches and wizards