Lu Xiaoyu, a low-born maiden, is sold into the Jing'an Marquis Manor as a concubine's maid. Intent on saving money to redeem her freedom and unwilling to be entangled in romance, she secretly takes contraceptive decoctions. Skilled in accounting and bookkeeping, she uses her talent to resolve a military provisions crisis during the manor's time of need. Facing the Marquis Zhang Jun's growing affection, the Princess's hostility, and her biological father's entanglements, she remains clear-headed and self-reliant. Even when caught between power and affection, Lu Xiaoyu stubbornly persists in redeeming herself to leave the manor, striving to break free from its shackles and pursue a life of her own freedom.