In a post-apocalyptic wasteland where memories can be extracted and traded, cleaning technician Shen Mo is responsible for erasing the painful memories of others every day. Until a routine operation, he glimpsed a bloody perspective of a serial killer. In the process of chasing clues, he discovered that all his nightmares pointed to a banned personality cloning experiment twenty years ago, and he was the first successful sample. When the surgical scar behind his ear begins to sting, Shen Mo must face a cruel truth: those bloody fragments that keep emerging may be his own memories that should have been "cleaned" away.
