Bogi, a talented opera singer student, earns money by babysitting the children of her cousin, whose marriage is in crisis. On the day of her final exam, she is under pressure and commits an error while she is with the children.

Bogi, a talented opera singer student, earns money by babysitting the children of her cousin, whose marriage is in crisis. On the day of her final exam, something happens to the the youngest child while in her care. Bogi panics and is incapable of telling the parents what happened. During the day, she starts being obsessed, and becomes convinced that the child is dying. She starts to lose her mind and feels like she has to punish herself.