Only the Rival Brings Spring Breeze

Medical professor Su Qian travels to ancient times and becomes a fallen heiress. She and her neighbor, the ungrateful son Shen Tinglan, hate each other at first sight. However, Su Qian does not realize that Shen Tinglan is actually the Nine Thousand Year Old of the current dynasty, and Shen Tinglan is unaware of the marriage contract they made since childhood. The two become a pair of happy rivals and gradually uncover each other's secrets.