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.

On the day of SAT, which continued to take place even in the era of zombies, high school girls drive themselves to the place of examination.