In the near future, a phenomenon called the "fog of forgetfulness" sweeps across the world, randomly depriving people of their memories. Lin Mo, a top "memory submariner", makes a living by sneaking into other people's broken consciousness and salvaging memory fragments. The only obsession deep in his heart is to retrieve the memory of his sister Lin Xi who disappeared in the fog. One day, a mysterious woman brought an undecipherable memory crystal, which actually contained clues to her missing sister. Lin Mo resolutely accepted the commission, but found that he was diving into a huge conspiracy constructed from memory. He not only has to fight against forgetfulness, but also faces the truth that memory itself may be the cruelest trap.
