I Started on Death Row and Was Signed by the Demon Suppressor?

The father was framed and the whole family was executed. A man in black robe gave him a life-sustaining pill. After eating, I signed a ten-year labor contract. If you don't eat, you will be asked to behead after returning to prison. From that day on, he became a trainee patrolman of the Demon-Suppressing Division. He rose from death row to the Qing Yi flag by himself. Until he discovered that he was a pawn from beginning to end. Behind the forbidden techniques is the strict party, Behind the strict party are the former emperor's old troops. Behind the old ministry is the emperor. Damn it, you are doing this and this! ! !