The "Mohen Old Museum" deep in the old alleys of Qingchuan City is the "treasure house of time" inherited by Su Nian from her grandmother - every old thing here hides the story of its owner, from a pen with peeling paint to an old clock that moves slowly, all with the warmth of time. Su Nian spent every day tinkering in the old museum, living a "happy life even if lying flat", until the cold-hearted tenant Gu Yanshen came to the door with an old suitcase full of scratches, and the peaceful life was completely broken.
Gu Yanshen rents a house just to find his sister Gu Yanxi, who has been missing for many years, and the clue happens to be hidden in the old objects in the museum. As plum-blossom pens that can write on their own, old photo albums that turn pages automatically, and dust boxes buried under old locust trees appear one after another, a mysterious "dust organization" gradually emerges - they covet the "memory fragments" in old things and try to use them to activate the control chip, and Gu Yanxi is their target.
