When a college entrance exam student discovers that his mother, whom he has secretly desired, is having an affair with his father's company superior, he is consumed by uncontrollable anger and sexual frustration. Soon after, he finds a hidden camera video showing his mother hanging laundry in her underwear and bathing, leaving him shocked and trembling with the revelation of her infidelity. Upon returning home from cram school, he confronts his mother, who instinctively slaps him across the face. Enraged by the slap, the son violently overpowers her, accusing her of adultery as he forcefully rapes her. This impulsive and destructive act completely shatters the relationship between mother and son.