In Rain City, memories can be pruned and deleted just like data. Lin Mo is a top memory trimmer. He numbly removes pain for his clients, but his own past is blank. When he received a mysterious commission to deal with a ghost memory that belonged to no one, he was drawn into a huge whirlpool. The disaster scene flashed in the memory fragments and the woman's vague smile made him feel inexplicably palpitating. He gradually discovers that this memory does not come from the client, but from his own deprived past. In order to find the truth and himself, Lin Mo must dive into the sea of oblivion built by the technology giants and confront the person who personally pushed him into the abyss.