Time and Space in QR Code

One o'clock in the morning, Hangzhou. Back-end engineer Li Changle scanned a QR code of unknown origin—he could travel through time. First comes space, then comes time. From his father's M5 wrench to his mother's unsent letter—his coffee table sank layer by layer, and each layer was a piece of evidence that someone was still alive after being altered, burned, or kneeled on. Then he received an encrypted message: Someone was using a trained model to batch scan the global historical archive database, find version differences, and then insert corrections. Yongzheng's imperial edict was changed back to "personally announced", and Chongzhen's Blood Robe was marked as a "questionable version". Everything on his coffee table became a solitary piece of evidence. His only defense is to get ahead of the algorithm—to go back to every tampered historical node and find a second piece of circumstantial evidence. It's not about picking up another thing - it's about finding someone who was there at that time, in a different medium, in a different language, who was unfamiliar with the first piece of evidence but pointed to the same fact. The energy that the door draws from the depths of the earth's crust is consumed every time, and the body temperature drops every time it comes back. A programmer, a coffee table, a thousand years of tampered history, and an AI model that is covering the truth in batches. It's not a historical time travel. It's evidence collection.