In the near future, an institution called "Worry-free Island" provides customers with precise memory deletion services, sealing painful memories in a database called "The Sea of Forgotten". Ling Su is the best memory архивист on the island. He is calm and professional, and regards forgetting as the ultimate mercy. Until a mysterious woman named Mu Yu arrived, and the memory she designated to delete was actually a car accident related to Ling Su on a rainy night that he had no memory of. When Ling Su dived into the depths of her memory and discovered that he was the protagonist of that painful past, his peaceful world collapsed. Whose truth is being erased? Is the "compassion" he firmly believes in just a carefully constructed lie? In order to find his lost self, Ling Su embarked on a dangerous journey upstream and against the entire forgotten system.
