One quiet snowy morning, a car rolls into a small hospital. Out of the car steps two women, one covered in scars, and the other, stabbed. Do-kyung claims that the unconscious, stabbed woman is her sister. Sergeant Hyun-ju begins to investigate what happened to the two women. Sergeant Kim goes to the address that Do-kyung provided, and only to realize that there is more thing than she thought in this case.