Many years ago, Ruan Jiaqi's mother Ruan Wei was the lover of Gu Yancheng's father Gu Weizhong. Gu Weizhong loved Ruan Wei, but Ruan Wei did not love Gu's father. Instead, she was forced to be with Gu Weizhong. Behind Gu Weizhong's back, she secretly fell in love with her childhood sweetheart Li Chengxiao. Soon, Ruan Wei became pregnant. Gu Weizhong thought Ruan Wei's child was his own, but the child actually belonged to Ruan Wei and Li Chengxiao.
For the Gu family, Gu Weizhong was forced to marry Qiao Xinyuan, the eldest daughter of Qiao Company, and gave birth to the male protagonist Gu Yancheng and the male protagonist's sister Gu Wanying. Many years later, Gu Weizhong learned that Ruan Wei died of illness and gave birth to a daughter many years ago. Gu Weizhong did not expect that Ruan Wei insisted on giving birth to the child. He thought that this girl was his child. So Gu Weizhong asked Gu Yancheng to take Ruan Jiaqi home. Gu Wanying hates Ruan Jiaqi, and Gu Yancheng also hates this sudden extra "sister" at first, but then slowly falls in love with her. Gu Yancheng has always been distressed by what he thinks is an unethical relationship, but because of a car accident, he discovers that they are not related by blood. Gu Yancheng's suppressed feelings could finally be released.