By chance, the young female forensic doctor Gu Yu met Qingming, a female ghost who was about to be reincarnated.
By a strange combination of circumstances, Gu Yu learns that he is exactly the same as Ayu, his lover from Qingming seven hundred years ago. During their brief relationship, Gu Yu gradually learns about the story of Ayu and Qingming, and increasingly suspects that he is the reincarnated Ayu...