Lin Yan, a modern young man and an ordinary graduate student in literature, is obsessed with Tang poetry. His AI assistant, “Doubao,” is his constant companion. A lab accident sends him and Doubao hurtling through a temporal maelstrom in a flash of blinding light. When he opens his eyes again, he finds himself in Chang’an in the twentieth year of the Zhenyuan era. A heavy snowfall binds his fate tightly to that of Li Bai, the Immortal Poet.