Ji Chang'an, the eldest young lady of the Ji family, is reborn back to the day her father chose a matrilocal son-in-law for her. In her past life, she was plotted against by Wen Yesong and Shuang Qingman, resulting in the destruction of her family and death, with only the guardian black snake, Hei Yuhe, risking his life to save her. In this life, she returns with the Snake Lord, breaks off the engagement, seizes power, cleanses the inner courtyard, exposes the conspiracy of the Wen family and her birth mother, takes control of the Ji family, and joins forces with Hei Yuhe for revenge, vowing to make her enemies pay in blood.