Joo-Ri discovers that her father is having an affair with the single mother of one of her classmates, Yoon-ah. The two teen girls try to stop the affair but fail to do so. When Yoon-ah`s mother becomes pregnant, Joo-Ri wants to solve the situation without her own mother knowing about it. Things take a turn for the worse when Yoon-ah spills the secret to Joo-Ri`s mother.