I'm at the Bureau of Disappearances: Investigating the Erased

Zhou Xu is an investigator in the Missing Persons Investigation Bureau called "Yihe", but he only takes on one kind of case - looking for people who have been completely deleted from the world. They have no household registration, no photos, no relatives or friends to remember, and even traces of their existence will disappear little by little. Only Zhou Xu can see the gray afterimages they left behind and read the memories before their disappearance through the items. A daughter who does not exist, a bus that has never run, a fourteenth employee in a company that no one remembers, a psychological clinic that specializes in erasing people's pain... As the investigation deepened, Zhou Xu discovered that all the abnormal disappearance cases pointed to the "Echo Project" ten years ago, and also pointed to the sister that only he still remembered. But when people around him began to forget his name and his identity could not be found in the files, Zhou Xu had to face a more terrifying question - was he looking for someone who had been deleted from the world, or was he himself the person who shouldn't exist?