In the future city "Xin Feileng Cui" where memories can be extracted, stored and traded, Ling Chen, the top "memory submariner", is immersed in the broken memories of others all day long, just to find a key piece of his lost past. A mysterious commission breaks his stagnant life: an elegant woman named Evelyn asks him to retrieve a "ghost memory" that should not exist from the memory data of a deceased technology giant. This journey deep into the consciousness of death not only involved Ling Chen in a huge conspiracy about the ethics of technology and the truth about human nature, but also brought him infinitely close to his forgotten secret - a truth that could overturn his entire world. On the island of memory, he must face the deep sea of forgetfulness.
