In the future, human memories have turned into entities, and forgotten memories have gathered into a dangerous restricted area called the Sea of Forgotten. Lin Zhou, a top memory scavenger, dives into the sea of oblivion day after day to salvage the lost memory fragments in order to save his sister who is eroded by amnesia. By chance, he discovered a golden core memory that belonged to no one. This memory not only involved him in a huge conspiracy to subvert the world, but also pointed to the concealed truth behind the birth of the Forgotten Sea. On the way to pursue the truth, he must make a choice between protecting his family and revealing lies, and his own past is also waiting to be salvaged in this ocean of forgetfulness.