Psychotherapist Gu Baizhou invented a revolutionary therapy that uses a special device to allow patients to enter a "mirror world" constructed from their own memories to face trauma. However, seven of his patients fell into deep coma during treatment one after another, and their consciousness was trapped in the maze of memory. In order to find out the truth, Gu Baizhou had to enter the patients' memories, but found that deep in their memories, there was a blood-stained door that did not belong to them. When he opened the door, standing behind the door was himself ten years ago.
