Nostalgia

Already having lived longer than the biblical quota of three score years and ten, Xu Ming is sent back in time by the secret Temporal Research Group on a mission to alter the past. When he returns, he finds the world is different than what it was. Which was the point, right? So everything's good? In which case, why does he feel so uneasy in the new world he has had such a hand in creating?

"Nostalgia" is the fourth story in the second movement of the Retcon series (the thirteenth overall). It builds upon the earlier stories, but is also an independent novella that can be read and enjoyed on its own.