In the center of the Sea of Oblivion lies the "Echo Island" that stores human traumatic memories. Lin Chen is the loneliest memory guardian on the island. He maintains the cold memory storage unit day after day, trying to find clues to his sister who disappeared many years ago. When a mysterious girl named Xiaomo was sent to the island, the blank spaces in her file and the nursery rhymes she sang that belonged only to Lin Chen and her sister completely broke the dead silence of the island. Lin Chen was forced to face a cruel truth: this island is not the end of memory, but a carefully designed lie. In order to find his sister and save Xiaomo, he must resist the huge shadow that created this isolated island.
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