Jihye, who has been married for three months and is the youngest daughter-in-law of the corrupt Lee clan that revels in wealth and influence, is driven by a desire to elevate her husband to the position of head grandson and herself to that of head wife. On the eve of the 'Sinryehoe,' a ceremony meant to cleanse the body by prohibiting sexual relations, her husband's twin brother sneaks 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.' This marks the start of a dangerous connection tangled in family ties, taboo, and longing!