Husband is an elite employee at a major corporation. His wife, Mika, lives a quiet life as a homemaker. One day, while doing laundry, Mika discovers a handkerchief with lipstick stains inside the washing machine, sparking suspicions of her husband's infidelity. As anxiety and doubt grow, she confides in her husband's high school classmate, who now works as a newspaper deliveryman. However, his response only deepens her unease. The situation spirals further out of control.