Chaoyang, whose husband lives with their son during a long work trip, empathizes with the complicated family situation of his son's classmate Koume, a person he has just met, and gradually forgives his own heart. Koume, who is desirous with her sensual body, penetrates through Chaoyang's unguarded gap and enters into a relationship with destruction. Chaoyang feels guilty, but forgets the pleasure of a place long untouched and entrusts her body to incessant caresses. The instinct to seek uterine pains begins to erode his rationality while repeating encounters with his son's classmate multiple times.