The arrival of an intimate letter prompts a young woman to bring her mother on vacation to a small Japanese town, where someone special resides.

18-year-old Yeong-seon lives in a residential facility for teenagers. She tries to leave the place and stands on her own two feet, although a social worker advises her to stay a little longer. On her birthdays, Yeong-seon meets with her mother. On one of these occasions, her mother delivers the unexpected news of her pregnancy.