Jihye, the new bride of three months and the youngest daughter-in-law in the wicked Lee clan, who enjoys wealth and power, burns with the ambition to make her husband the family successor and become the head wife. The day before the "Shin Rye-hee", a gathering that prohibits marital relations to keep the body pure, her husband's twin brother delves between Jihye's legs. "Not from behind. Please, young master." "It's a hole that makes me want to stick anything in it. You look like you'll get pregnant easily; you have the qualities of a head wife." The beginning of a fatal relationship intertwined with family, taboo, and honor.