In the "Salt City" where technology can strip away and trade memories, people exchange memories for new life or to escape pain. Lin Mo, a top mnemonicist, is known for his calmness and precision. He removed the memories of countless people, but he was trapped by a broken lullaby melody, pursuing his lost past. When a mysterious woman named Yi Shu appeared in front of him with a seemingly harmless request - to erase a happiest memory - Lin Mo's peaceful life was completely shattered.
