Kim Ji Young: Born 1982

Ji Young is a stay-at-home mom whose main responsibility is raising her daughter whilst her husband, Dae Hyun works a day job at an office. Through flashbacks we see that Jiyoung used to work at a marketing firm and was happy while she was being productive and having a career. She also looked up to one of her female seniors, team leader Kim, who has risen to quite a high position in the company whilst being a mother at the same time as there is discrimination towards working mothers in the workplace. A few years later, now as a stay-at-home mom, Ji Young starts to develop feelings of being trapped and unfulfilled. As well as losing a bit of her personal identity, she also suffers from postpartum depression. Due to all these, Ji Young unknowingly started to develop a mental disorder which consists of her seemingly becoming briefly possessed by the personality of her mother or late grandmother.