To pay off her debts, Du Lanyi sells herself as a maid and becomes a bedchamber servant to the mad prince. She thinks she's jumped straight into the fire, but because her face is identical to the prince's beloved, she wins his favor. Her sincere companionship and attentive care help improve his condition, and she gradually falls for him. She is promoted to secondary consort, earning the jealousy of the maids and the malice of noblewomen in the capital. Fortunately, he truly cares about her!