Seo-eun, having ended her relationship with her ex-boyfriend due to her shock at his small penis, seeks solace at Yoon-do's shop. While there, she inadvertently catches a glimpse of Yoon-do's remarkable size and becomes convinced that she won't encounter such dimensions again. Boldly, she suggests, "Let's sleep together. I'll make you feel good." Yoon-do, surprised by her unexpected advance, gives in to her challenge, leading to an overnight change in their relationship. How will the bond between these two childhood friends, who have now shared an intimate experience, continue to develop?