In a peaceful South Korean city, young Min-jae leads a quiet life as a university student. However, his world takes an unexpected turn when his charismatic cousin, Soo-yeon, returns from studying abroad. The spark between them is undeniable, but there's a small detail: the family learns that the connection between cousins is not entirely accepted by cultural traditions. As Min-jae and Soo-yeon spend more time together, sharing secrets and desires, the tension between love and family begins to grow.