A household guardian spirit separated from the Cai family since the Western Han dynasty, Mu Yan is a snake demon with 2,800 years of cultivation. A traffic accident indirectly causes him to kill Cai Qianshou, a descendant of the Cai family. As Qianshou lies dying, the moment his name surfaces from within him, Mu Yan realizes that Qianshou is the Cai descendant he has waited a thousand years to find. To save Qianshou and bring him back to the world of the living, Mu Yan and Qianshou embark on an adventure among mortals.
But the accident, influenced by Mu Yan's supernatural powers, has already torn a rift in time and space. In the days that follow, Qianshou and the people around him each see their past lives in their dreams. A murder from the Western Han dynasty draws everyone in Qianshou's present life into its web... And Mu Yan, a household guardian spirit who should never interfere in the mortal world, once infiltrated a feudal lord's army during the Western Han dynasty to protect Qianshou's past life. How will people in the present face the surging waves of love and hatred from the past lives of Mu Yan, Qianshou, Yun Zhi, and the others?
When memories of loving Yun Zhi awaken in both Mu Yan and Qianshou, they become enemies. Yet fate has other plans: at the final moment, Qianshou ultimately sacrifices his life to save Mu Yan.
When Qianshou wakes again and stands before the mirror, a pair of golden python eyes blinks for one second, then instantly returns to pitch black.
This is Qianshou's secret.
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