She and her husband are drifting apart from each other, while her husband has been refusing sex with her and treating her like a ghost. As her unhappiness with her husband is growing bigger.
She attends her high school alumni meeting, where she encounters her first love, Seong-jin. Shin-hye is drawn to Seong-jin, who is a cool handsome grown-up man now. She slowly steps into the forbidden realm, as to say ‘affair’ in spite of herself.