Youngjun declares he likes the narrator's wild sister and wants to date her, despite warnings.
The episode is a first-person narrative about the narrator's friendship with Youngjun, which began in childhood in the same apartment complex. Youngjun is academically successful, entering Myeongmun University easily while the narrator becomes an office worker. After Youngjun's painful breakup with his first love, the narrator contemplates introducing him to his older sister, who is single. Youngjun visits the narrator's house and interacts with the sister, showing interest. In a later conversation, Youngjun confesses he has developed feelings for the sister, despite the narrator's warnings about her wild personality and taekwondo skills. The narrator reveals an incident where his sister kicked him unconscious during a fight. Youngjun remains undeterred, expressing admiration for her strength. The narrator arranges another meeting, and Youngjun and the sister start secretly dating, which the narrator deduces when he calls Youngjun during a concert his sister attended. The relationship progresses, and they marry after two years of dating. A decade later, the narrator notes that Youngjun has never been hit by his sister's backstabbing and lives happily, though the narrator remains nervous about her temper. The story concludes with a wish for their continued happiness.
