Her husband is a successful corporate elite at a major company, while his wife, Mika, lives peacefully as a devoted homemaker. One day, while doing laundry, Mika discovers a handkerchief stained with lipstick inside the washing machine. Instantly, she begins to suspect her husband of having an affair. Overcome with anxiety, she confides in an old classmate of her husband's who works as a newspaper deliveryman. That single act of trust will bring drastic changes to both their lives.