There is a bottomless cave hidden in everyone's memory. Some people use it to bury secrets, others rely on it to anchor themselves, but Chi Yan can pry open this door, sneak into the folds of other people's memories, and salvage the truth that has been gnawed by time.
As a "memory caver" who wanders in the shadows of the city, Chi Yan's special ability is a double-edged sword: every time he dives in, it is like measuring the fault line of memory on the tip of a knife. The stinging pain in his skull and the fragments of emotions that do not belong to him always remind him that buried at the bottom of the cave is not only the truth, but also an abyss that can swallow up reason.
When the "suicide case" of female star Lin Wei came to her door, Chi Yan glimpsed a series of strange honeycomb symbols and a face that had been deliberately erased in the crux of her memory. As the investigation deepens, more victims appear one after another, and the same horrific illusion is implanted in their memory points. The mysterious organization "Hive" that controls all of this is leading him step by step to his lost ten years of memory - where his past as an experimental subject "No. 73" Sleeps, hiding the ultimate answer to why he can open the "Memory Point".
