Jihye, a newlywed of three months and the youngest daughter-in-law of the depraved Lee clan, which enjoyed wealth and power, burns with ambition to make her husband the head grandson and herself the head wife. The day before the 'Sinryehoe,' a ritual to purify the body by forbidding marital relations, her husband's twin brother creeps between Jihye's legs. 'Not from behind. Young Master, please.' 'It's a hole that makes me want to put anything in it. You even look like you'd get pregnant easily; you have the qualities of a head wife.' The beginning of a fatal relationship intertwined with family, taboo, and desire!