A long novel with a suspenseful detective + soft science fiction emotional setting, constructing a special world view: after a person dies, the inner emotions will be condensed into a solid crystal - the lingering sound stone. Hate, fear, love and grief will turn into different colors. The test writer can touch the lingering sound stone and read the deceased's dying memories and emotions to detect the murder. The transparent and hollow white noise echo stone represents that the deceased's emotions have been completely formatted and washed away artificially, and is the core clue of the murder in this game.
