It's Christmas in the Super Junior dorms, but the atmosphere is more befitting for Halloween. A mysterious "Santa" is on the loose, an unknown person who enters the dorms every year to leave presents, and then disappears. Zhou Mi and Henry are determined to investigate - but they, too, have secrets of their own. Most importantly, who will get kissed at midnight?

A crazy twist of fate left Yesung with no choice. He was to become a resident of a real madhouse. However, nothing's wrong with him - and he's scared to death by the long months he will have to spend in a freakin mental institution! Little did he know that he'll later think of it as the best thing that ever happened in his entire life.