This is the story of a mother who is in love with her daughter's lover.

An accountant visits her daughter who is secretly living with her boyfriend who is a fraud. She is surprised by what she sees and hears. Soon, a dangerous cohabitation begins with her daughter's lover.

Mi-seon loves her family, but she loves having sex with younger men. One day, she hears her sex partner, Jeong-woo, has a brother and she feels more attracted to the younger man. Mi-seon goes to Jeong-woo's house and tries to seduce his brother when he's alone. However, her new sex partner is her daughter's boyfriend.