On a hot summer day, Woo-joo (20 years old, female), who was recovering in the countryside, comes to Seoul for an entrance exam interview. After her interview, she contacts her sister who is studying in Seoul, but her sister does not contact her. But her sister died. The universe cannot accept her sister's death. The universe left in Seoul to organize her sister's luggage is behind the scenes, and she goes to meet her older sister's acquaintances during her lifetime.