“Does my groom have a big one… or a small one?” “The best husband is a man blessed with both a handsome face and a large manhood.” That’s a line from A Must-Read Before Marriage, an erotic novel that once moved the hearts of countless women during the Joseon era. Seo-yeong, who has just received a marriage proposal, is one such woman. To confirm the abilities of her betrothed, she boldly sets out herself— only to mistakenly question the wrong man, thinking he’s her fiancé’s brother. After hearing that his is “similar,” she’s left reeling in embarrassment—until he makes her an unexpected offer. “If you really want to satisfy your curiosity, come to the mill tonight.” Unable to overcome her curiosity, Seo-yeong heads to the mill, completely unaware of what awaits her there…