By coincidence, Seunghyun comes across a fancam of the idol his girlfriend loves. The video, which has already garnered 5.48 million views, serves as the ultimate bias-making fancam, featuring none other than his former next-door neighbor, Seohyun, who once made a confession to him back in grade school. Since watching that video, Seunghyun finds it impossible to stop thinking about it. Even when he is with his girlfriend, Seohyun's image keeps appearing in his mind. "Am I really losing to Seohyun right now?" "N-no, that's not it." Feeling overwhelmed, Seunghyun escapes back to his hometown, only to encounter the very person who once ignited his private fantasies. "Hyung, it's me. Seohyun!" Now back together, Seohyun starts to playfully tease Seunghyun with increasingly bold and intimate flirting.