Joo-Hee is a married professor. She is stunned to learn that her husband Dong-Hyuk with her own student Joo-Hee. Joo-Hee pretends she doesn't know about their relationship and invites Yeon-Mi to her home. Dong-Hyuk and Yeon-Mi, believing Joo-Hee is oblivious to their affair, continue their intimate relationship at Joo-Hee and Dong-Hyuk's home. Joo-Hee though has her own plans.