History is on the verge of collapse due to the proliferation of illegal travelers.
In response to the crisis, the "Time Sequence Management Bureau" was quietly established.
The "Guardians" under his command are historical guardians who are proficient in the skills of each era and are distributed in various worlds.
Their mission is only one: to silently erase all disturbances caused by time-travelers and ensure that history returns to normal.
When there are more and more travelers and the "Guardians" are helpless, they will send a signal to the headquarters.
The headquarters will dispatch "anti-travelers" to carry out purge operations and ensure that history returns to the right track.
Purpose: Protect history