The protagonist Han Mo accidentally activates the "traceability of all things" system hidden on his mobile phone - by pointing at any item/event, he can view its "past trajectory", "hidden value" and "future hazard" in real time (for example: scanning spoiled takeaways, you can see rats in the kitchen eating ingredients; scanning abandoned factories, you can find gold buried underground during the Republic of China; scanning passers-by, you can predict that they will pick up a million cash check in the park three hours later).
