On the eve of her wedding in her previous life, her legitimate elder sister, Su Mingxiu, eloped with her lover. To preserve the imperial decree, the Su family forcibly drugged their concubine-born daughter, Su Jianyue, and pushed her into the bridal sedan meant for her sister, marrying her off to Xie Chengyan, heir to the Marquis of Dingyuan. Throughout the long years at the marquis's residence, she endured a marriage that was never meant to be hers, giving her heart to someone who would never return her love. Xie Chengyan's heart belonged entirely to Su Mingxiu, who had returned after fleeing. All he had left for Su Jianyue was coldness and suspicion. Then a forged distress letter placed all the blame squarely on Su Jianyue.