Programmer Lin Wan meets architect Gu Shen at a blind-date dinner and feels an inexplicable sense of familiarity with him. A mysterious note at a bookstore during a supposed chance encounter, along with old books and photographs at a hospital at the foot of a mountain in Hangzhou, gradually help Lin Wan piece together a truth someone deliberately made her forget: she and Gu Shen were once deeply in love, but an intracranial aneurysm pressing on her hippocampus led her to undergo four surgeries and suffer four bouts of amnesia. Each time she recovered her memories of Gu Shen, the aneurysm returned, forcing her to undergo surgery again. Each time she woke, she had forgotten him once more. For six years, Gu Shen repeatedly approached her, waited for her, and courted her all over again. He never dared to tell her the truth outright, instead guiding her to discover everything for herself through notes, old keepsakes, and places she had once visited. At the end of the story, Lin Wan "meets" Gu Shen for the seventh time (in reality, she has regained some of her memories for the seventh time) and finally pieces together the whole truth. Faced with the choice of undergoing a curative surgery that might permanently erase her emotional memories, she decides against it. She would rather risk losing her memories again and starting over in the future, falling in love with the same person again and again.
