On the surface,Yeo-un is the perfect college student—popular, flawless, and insanely good at what she does. But underneath that polished exterior, she hides a kinky side that thrives on being treated like a dog during S&M play. The only obstacle keeping her from living this double life? Jin-young. Jin-young approaches her and flirts with her saying she looks like a fox, but then she humiliates her, calling her "pineapple-haired sunbae," and takes full advantage of her weakness after an incident. “That's not what you’re supposed to say to me, sunbae." “You're a dog, aren’t you? Then bark.”