Gayoon has been preparing tirelessly for 2YOON's debut. These days, she forgets to eat, to sleep, to smile. All she's been doing is practice, practice, and more practice. The cheerful and bubbly Gayoon is nowhere to be found. And the person most concerned? Why, her boyfriend, none other than BEAST's very own Yoon Doojoon. Will he be able to knock some sense into a foolish, hardworking girl like Gayoon?