In the near future, Hailin City, where memories can be accurately stripped and stored, Gu Chuan, a top "memory tuner", makes a living by helping others forget their pain, but he has never been able to heal the scars of his deceased wife. When a mysterious woman code-named "Zero" appears with a seemingly simple request - to erase the memory of a melody - Gu Chuan is involved in a huge conspiracy. He discovered that the forgotten memories did not disappear, but merged into an abyss of consciousness called the "Sea of Forgotten", and that melody was the key to awakening this dead sea and uncovering the dark truth behind technology. Gu Chuan must dive into the ruins of his own and others' memories and face the past that he most wants to escape before it's too late.
