A seemingly happy family gets rocked by the suicide of the 14-year-old daughter.

An old man suffering from depression is found dead, and his housekeeper, Mi-ran, is charged with the murder. Mi-ran’s defense attorney, Sun-ho, is surprised to learn the only witness to the crime is Ji-woo, a teenage girl with Asperger’s. Will Ji-woo be able to take the stand and provide a valid statement?