In the near future where memories can be accurately deleted, Ling Zhou, the top "memory scavenger", makes a living by erasing the pain of others, but knows nothing about his own blank past. When a mysterious woman Su Wan brought a seemingly simple request - to delete a happy memory about "him", Ling Zhou actually caught a glimpse of an afterimage related to himself during the operation. This memory fragment that should not exist is like a key, opening the forbidden door to his own truth. He began to realize that the skills he relied on for survival might be the prison that imprisoned his soul. Under the dual dilemma of being hunted by a huge organization and entangled in the phantoms of the past, Ling Zhou must find his own island of memory in the deep sea of forgetfulness.
