In late 1700s Korea, Lady Cho challenges the playboy Lord Jo-won into seducing and sleeping with her husband's coming young, virgin concubine. Lady Cho agrees to sleep with him if he succeeds.

Seo-hyun is an ordinary housewife in her late thirties with a ten-year-old son and a successful architect husband. For her, life is a series of banal routines. Her sheltered life is suddenly threatened with the appearance of Woo-in, her much younger sister's attractive new fiancé.