City map corrector Lin Shu's job is to delete streets that "should not exist" on the map. Until a citizen reported that the entire street had disappeared, but the mother was still trapped inside. Following the old map, Lin Shu entered Huaian Street, where residents had lived for twenty years and all the clocks stopped at nine-seventeen, and saw his unborn sister Lin Yao in an old photo.
He discovered from this that there were two conflicting versions of reality in the world. Every correction means that a street, a group of people, or even a period of life has been completely erased; and the reality called "error" has been lived and loved by people, and is equally real. What's even more frightening is that Lin Yao only exists in a false reality.
As cities, towns and even the entire world gradually overlap, Lin Shu must decide: obey the stable map and delete his sister with his own hands, or draw a map that has never existed for all the people who "should not exist"?
