The protagonist, Lin Yu, can transmigrate to various historical periods of the Ming Dynasty using the mysterious family heirloom, the Yunqi Secret Record, and its tokens, such as a ginkgo wood tablet and a bronze fish tally. Transmigration must be triggered by specific historical tokens, and each journey leaves its mark on the present, such as scars or fluctuations in memory. To return, he must find the token corresponding to that era. The family's mission and the search for historical truths run throughout the story, ultimately pointing to its central theme: "The faint light of history illuminates the road ahead in the present."
