In the future city "Xinhai City", memories can be deleted accurately. Lin Mo is a top "memory scavenger" who erases the pain of his clients, but he is troubled by a blank memory about his missing sister. One day, a mysterious woman named Jing brought a seemingly simple request: to delete the memory of a lighthouse. However, during the operation, Lin Mo actually heard the nursery rhymes her sister had hummed from the depths of her memory. He realizes that this forgotten lighthouse is the only beacon leading to the truth about his past. In order to find his sister, Lin Mo stepped into a huge conspiracy whirlpool composed of lies and tampered memories. Every step he took could make him completely lost in the deep sea of oblivion.
