Yujeong, who works as a night shift nurse at a general hospital's cardiology department, is now told that her 12th-grade younger sister, Kijeong, has been arrested by the police as a suspect in an infant abandonment case. Only then does Yujeong start to make desperate efforts to rescue her sister.

When the man responsible for their youngest daughter's death is suddenly released from prison, a grieving mother, Ok-sil, and her three daughters embark on a revenge-fueled road trip to Gyeongju.