In the near future where memories can be read and navigated, Ling Su, the top "memory diver", specializes in sneaking into the last memories of the deceased to pursue the truth of death. When neuroscience guru Gu Qingshi mysteriously "committed suicide", Ling Su was entrusted by his mysterious assistant and entered the memory maze of this genius' brain. However, what he found was not a simple motive for suicide, but a tower of thoughts blocked by ice and snow and full of data ghosts. Each dive brings him closer to a shocking secret that could subvert the world, and at the same time, his own spirit is gradually eroded. He must find the answer before his memory completely collapses, otherwise, he will become the next prisoner in this ruins of memory.