YMMV / The Call (2020)

• Complete Monster: Oh Young-sook initially appears to be a woman abused by her adoptive shaman mother, but after help from heroine Seo-yeon in the future in saving her life, Young-sook murders her mother and discovers a joy of murder. Killing an innocent farmer who discovers the killing, Young-sook tries to force Seo-yeon to help her by murdering her father; torturing her as a child with boiling water; and proceeding to kill anyone who gets in her way, surviving to become a prolific serial killer in the present while attempting to murder Seo-yeon's mother and her in both present and past.