Gu Heng studies ancient astronomy. He knew that the new dynasty would fall, that Wang Mang would be defeated, and that Liu Xiu would win.
He thought that the advantage of a time traveler was knowing the ending.
But when he saw with his own eyes the system implemented by Wang Mang, touched the scales on the bronze calendar plates with his own hands, and heard with his own ears the standardization plan discussed in the court——
He realized he was wrong.
There is no use knowing the ending. Because someone is rewriting the opening.
That person is also a time traveler. That person is Wang Mang himself.
The "Wang Mang's failure in restructuring" in the history books may have never been a joke - it was a secret war between two time travellers, which ended with one of them being completely wiped out.
This time, it was Gu Heng's turn to be erased.