Bong Gi used to have ambitions for his future, but they now feel like a distant memory. He's let himself go, becoming obese, lazy, and jobless. People find him unappealing, despite his longing for companionship. He's never had a girlfriend and spends his nights daydreaming about women. Though he despises his own existence, he finds solace in the online world and his obsession with gaming. One morning, after a long night of gaming alone, Bong Gi wakes up to find himself transformed into a woman. Confused by his unexpected transformation, he seeks guidance from a young woman named Sae Mi. However, things become even more complex when he becomes infatuated with Sang Woo, Sae Mi's older brother who once bullied him in school.