A young couple, Wan-jin and So-hee, are living with Wan-jin's single father, Seok-bong. Seok-bong was preying on his daughter-in-law, who was doing the housework and preparing meals for him while her husband was away at work. He pretended to have dementia and attacked her. So-hee, who was suffering from her shame, suggested to Wan-jin to hire his father a caregiver, saying that his father seemed to be suffering from dementia, and so Bok-ja, a sexy and voluptuous caregiver who was about…