Meng Jia divorced her husband and moved to live separately. Suddenly, a call from the past comes to her landline and her life will never be the same.

To escape her husband's domestic violence, Meng Jia unexpectedly answers a call from Ru Mei, a previous occupant of her new home. Initially, their shared curiosity about the time-traveling call and their mutual experiences as victims of domestic violence bring them closer. However, the relationship takes a dark turn when Ru Mei kills her abusive husband. Feeling abandoned by Meng Jia, Ru Mei's repeated attempts to reconnect fail, leading her to start a crazed campaign of revenge against Meng Jia.