Memory specialist Cheng Nan can extract and modify people's memories, and runs a "Wangyou Office" in an office building. Until a man who claimed to have "lost ten years of memory" came to the door. When he lay down on the extraction chair, what Chengnan saw was not a blank space, but a precise artificial seal. What's even weirder is that - locked deep in the seal is the memory of a woman who keeps calling for help. And that woman was clearly Chengnan herself who "died accidentally" ten years ago.
