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In Ximen Community, Linyuan City, the shadow of an old residential building is in the wrong direction. The real estate agent watched for three days to confirm that it was not an illusion and called the police. The alarm was forwarded layer by layer, and finally landed in a department that could not be found in public files. Shen Tuo and his partner Cheng Yu arrived at the scene. The shadow event is rated as Level 1 and is monitored according to the process and waits for natural dissipation. This is the daily routine of the Property Management Bureau. The Property Management Bureau has no ability to repair and can only investigate, record, block, and keep confidential. Shen Tuo is a Ph. D. Graduate in physics. Three years ago, he saw something in an experiment conducted by his mentor's research team. After that, he dropped out of school and was recruited by the Property Management Bureau as a "special witness." The shadow incident leads to an unexpected reflection in the hospital, a thinning wall in an old residential building, and an unpredictable distance in the home of a retired physics teacher. The locations of several independent incidents can be connected in a curve on the map. Shen Tuo found a random geometric sketch in his notes from back then - the shape was familiar. He didn't tell anyone. He clearly remembered the original record of the experiment three years ago. Lin Min kept a printout. The two copies are different. Both copies are self-consistent. The instructor told him: Both are true. Someone in the property management bureau knows more, but won't tell. His partner was recording his reactions in some rhythm unknown to him. He himself began to think about a possibility that he couldn't rule out using the methods of a Ph. D. In physics-- It's not a memory error. There are multiple versions of the event itself. Well, what about himself.