In the future city "Cocoon City" where memories can be deleted and stored, Lin Chen, a top memory cleaner, makes a living by erasing the pain of others, but is trapped in his heart by a blank past. One day, the mysterious woman Su Jin brought a bizarre commission: she wanted to retrieve a "stolen" memory, a memory about a person she couldn't remember but felt extremely important. As the investigation deepens, they sneak into the "Abyss Archives" where all the forgotten things in the city are stored. Lin Chen was shocked to discover that Su Jin's lost memory was closely connected with his own blank past. When the fragments of the truth are pieced together, a cruel choice in the name of love will push both of them into the abyss of memory and forgetfulness.
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