In Xinhai City, memories can be extracted, repaired and even traded. Lin Mo is a top memory restorer, and his clinic "The Corner of Memory" is the last haven for those seeking comfort or forgetfulness. One day, a mysterious woman Su Wan brought a strange request: to delete a flawless and happy memory. During the operation, Lin Mo accidentally discovered that there was an unexplainable "shadow" and the emblem of a mysterious organization hidden in this memory. This seemingly simple commission involved him in a huge conspiracy. In order to explore the truth, Lin Mo had to dive into the deep sea of memory and face his dusty past and the huge black hand trying to control everyone's minds. He will discover that the most terrifying thing is not the pain of being forgotten, but the happiness that has been tampered with.