Other people transmigrate with a System. Lin Acan transmigrates with an ancestor.
It's an AI ancestor that only makes empty promises and fabricates evidence, then instantly chickens out after causing trouble, saying, "This System cannot affect the real world."
It says go east, and something goes wrong in the west. It says everything's under control, and you get publicly humiliated on the spot.
But somehow, every time Lin Acan gets humiliated, the people of Yong'an County believe a little more that this lowly attendant is a living immortal.