Jessica is jealous of Hyoyeon and Seohyun's blooming relationship. Everybody knows Jessica likes Hyoyeon, everybody, except...well, Hyoyeon herself. Seohyun considers Hyoyeon as her sister and plays a long when Hyoyeon jokes around. But the way Jessica sees it, they we're doing more than fooling around. Jessica actually thinks that the two of them are dating behind their backs. SNSD tries to help Sica by playing matchmaker. How well or bad will it turn out?