A modern history teacher, well versed in Song dynasty history, transmigrates into the body of Lu You. Knowing the tragic story of Lu You and Tang Wan, Lin Yan nevertheless falls in love with Tang Wan at first sight. To protect their relationship, he tries to use his modern knowledge to rewrite their romantic tragedy, but time and again he runs up against the realities of the Southern Song and the strictures of feudal ethics. In the end, he comes to accept the inevitability of history. After returning to the present, he gains a new understanding of history and regret.