You, Lee~~~, are B2ST's # 1 fan. You are the president of the most popular online fan club, where Beauties from all over the world gather to spend endless hours talking about how delicious Kikwang's abs are, or giggle over Dooseob's new captured moment. So what do you do when there is suddenly a hot new rumour about B2ST member Junhyung and some mystery girl? Sacrifice yourself of course!

Taking along your trusted friend, Eun Mi, your mission begins at private school, Prestige Seoul High School (where all 6 B2ST members are forced to attend), where you disguise yourself as a cute guy and bribe the principal to let you room with them.

B2ST, however are not pleased with the idea. They plan to make your school year hell. But things take a new turn when each member slowly finds out that their new roommate is actually a... FANGIRL IN DISGUISE!?!?