Tells the story of Zhang Changsheng, who carries modern memories and is reborn, being born prematurely into an ancient peasant family. Relying on two lifetimes of accumulation and studying bitterly by a cold window, he advances all the way from a humble family member to a juren in the imperial examinations. After entering officialdom, he is promoted step by step from a county magistrate to a prefect, being an upright official who brings welfare to the local people. His grandson, Zhang Baigui, is a youthful prodigy who rises to the position of Grand Secretariat official yet gets deeply mired in a perilous crisis over the succession struggle. To safeguard the family's thorough safety, Zhang Changsheng sets up a scheme with his life to make his grandson observe a period of mourning and avoid calamity. When one lifetime ends, he steps into the second lifetime of immortal cultivation samsara, carrying his lifelong obsession with seeking immortality.