The former night watchman Tianjiao Ye Hui was framed by his best friend, the princess Jiang Yunli, and was imprisoned in the Lake Sky Prison for being accused of being a flower picker. In a desperate situation, he obtained the "Taishi Demon Sutra", broke out of prison, and transformed into a ruthless demon. He gathered the evil spirits in the prison and stirred up the world from the night watch department, vowing to make the former betrayers experience all the pain he had suffered.
