In the future city "Xindu" where memories can be extracted, repaired or even erased, Lin Mo is a highly skilled "memory repairman". He makes a living by repairing people's damaged emotional fragments, but he always guards the everlasting painful memory of his deceased wife in his heart. One day, a mysterious girl named Xiaotong came to the door with a memory fragment listed as taboo by the "Social Harmony Bureau" - "Echo" and asked him to restore the truth hidden in it. Lin Mo is drawn into a huge whirlpool. He must make a choice between guarding the island of personal memory and diving into the sea of oblivion that obliterates everything. This choice will determine whether countless people are awakened by the truth or sleep forever in false peace.
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