When Su Qing was little, a high fever left her with delayed mental development. For the sake of her biological daughter, Su Wan, her stepmother arranged a marriage swap, forcing Su Qing to take her place as the bride. Bai Yang, her husband, initially realized he had been deceived, but as they spent time together, he genuinely fell in love with her. After receiving treatment, Su Qing recovered completely from her illness but lost all her memories. Bai Yang remained devoted to her, refusing to leave her side and determined to protect her all over again. After enduring the schemes and framing orchestrated by Su Wan and others, Su Qing regained her memories. Together, they overcame every obstacle and finally found the happiness of a love wholeheartedly returned.