In the near future where memories can be read, edited and sealed, top memory organizer Gu Chuan is known for his calmness. He can wander through the most confusing and profound memory mazes of others, but he is unable to piece together the complete picture of the day his sister died unexpectedly. One day, a mysterious female client named Lin Ruoshuang brought a strange commission: to retrieve a childhood song she had forgotten. When Gu Chuan sneaked into her island of memory shrouded in thick fog, he was horrified to discover that the lost ballad was the last lullaby his sister hummed to him. Two broken souls, a tampered past, the outline of the truth is being quietly outlined in the echoes of the past.
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