Yan Yutong grew up with Ximen Yi, who lost his father in his early years. The two have been dependent on each other for many years. Ximen Yi has been taking care of Yutong as his brother for many years. Yutong has a secret love for him. One day when he was seventeen, Yutong confessed to Ximen Yi, but Ximen Yi kicked him out of the house and made an agreement with him to meet again in five years. Ximen suffered terribly because his father told him before his death that Yutong was his half-sister. Three years later, Ximen made an exception and appeared in front of Yutong and took her to see her mother. Upon seeing her, Yutong started to pursue Ximen again. The story begins here...