Nineteen-year-old Choi Yeo-reum feels isolated and abandoned following her parents' divorce. After discovering painful details regarding her family's past, she struggles with severe emotional distress and a sense of hopelessness. Her life takes a turn when she meets her next-door neighbors, the Na brothers. The brothers are navigating their own deep grief and recognize the signs of emotional struggle in Yeo-reum. Moved by empathy, they reach out to support her, offering a sense of community and kindness that begins to help her feel less alone in her struggles.