In the future city "New Arc" where memories can be read, edited and traded, the top "deep diver" Lin Jing makes a living by sneaking into the consciousness of others and repairing or extracting memories. Deep in his heart, he was tortured by the mysterious disappearance of his sister Lin Xi many years ago. That memory was like a black hole that could not be filled. A difficult commission approached him - the core creation memory of technology giant Gao Yuan was stolen by an unprecedented method, leaving a dangerous "memory hole" in his mind. During the investigation, Lin Jing was horrified to find that the method used by the thief "Morpheus" had a strange resonance with his lost memory fragments. This is no longer just a commercial commission, but a forced dive into one's deepest fears. He must dive into the deepest abyss of memory, because what echoes is not only his client's past, but also his own lost soul.