In Wutong Lane among the high-rise buildings in Xingcheng City, moss marks are hidden on the bluestone slabs, and the sounds of old clocks and sewing machines are intertwined. Chen Ye makes a living by repairing old things and can hear the whispers of objects; Lin Xiaoman guards the noodle shop and can see the shimmer of objects. Once, when Chen Ye repaired and picked up an old radio, he heard the cry of searching for a bracelet. The silver bracelet he unearthed based on clues caused blue mist to rise when it touched Lin Xiaoman - this was an "echo" that carried unfinished thoughts.
Since then, strange things happened frequently in the alleys: the old clock warned late at night "Don't throw away precious things", the pages of used bookstores revealed the voices of people's hearts, and the vase talked about the omissions of the past. What's even more troublesome is that when developers come, the leader is repeatedly blocked: the car stalls, the contract is blown, and even the echo of his grandfather's begging. Chen Ye and Lin Xiaoman discovered that this is the guardian rule of the old city: memories are hidden in old objects. If the memories are not lost, the alleys will not be demolished.
The developer wanted to destroy the property and erase the memory, so the two had to unite with their old neighbors and use "echoes" to fight back: the old clock awakened childhood memories, the old book revealed the confession of the developer's grandfather, and the silver bracelet evoked the kindness of decades ago. But they never knew that behind this guardianship battle, there was a bigger secret - the accident of Chen Ye's parents was closely related to the "old object" lost in the alley, and the Lin Xiaoman family was the guardian of this object for generations. The century-old secret of Wutong Lane will eventually be revealed along with the life experiences of the two people.
