In the future city "Mirror City" where memories can be extracted, stored and traded, Ling Chen is a top memory collector. He is like a lonely tower guard, keeping the past for his clients that they don't want to carry but can't let go of. One day, a mysterious woman named Su Yin brought a bottle of stormy and gloomy memories and made an unprecedented request: destroy it completely. Ling Chen struggled between professional ethics and strong curiosity, and finally decided to read this memory first. However, when he was immersed in it, he discovered that this painful memory that should have belonged to a stranger actually contained a key that could unlock his own lost past. The fate of him and her is imprisoned on this island of memory by a common secret.
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