History is not a linear closed loop, but has numerous "fold nodes" - when major historical events (such as victory or defeat in wars, dynasty changes, institutional changes) occur, "ripples in time and space" will occur due to the choices of key figures and unexpected factors, forming weak branches of parallel history (called "folds").
If these folds are out of balance for a long time, the "historical anchors" corresponding to the era will loosen, causing an implicit collapse of real time and space (such as local disasters, cultural faults, and technological regression).
There is a secretly inherited group of "calibrators" who are born with the ability to perceive the folds of time and space, and have the mission of "calibrating historical anchor points" - not to tamper with history, but to eliminate abnormal folds and return history to the "main line of stability" by intervening in key nodes. The calibrator cannot directly change the established general trend (such as the overall trend of the rise and fall of dynasties), but can only correct the "deviations" caused by accidents.
The source of the calibrator's power: "Historical Inkstone" - a token passed down by calibrators of all generations, which can reflect the historical truth of the corresponding era and sense the location of folds, and only the calibrator can touch the "historical anchor point" (key person/item/scene). Shi Yan needs to maintain his power by absorbing the "historical charm" (participating in major events and witnessing key moments) and cannot abuse it.
