The Sect Was Destroyed, I Turned My Back and Worshiped as a Demon King

My name is Xiao Jin. I was once the holy son of the Qingxuan Sect who was not seen in a century, and the hope for the future of the righteous way. When the sect was destroyed, I burned my essence and blood and fought to the death, but before I died, I awakened the [Villain System]. Bite! It is detected that the host's behavior of sacrificing herself for others poses a serious threat to the villain's cause, and hereby punishes her: her cultivation will be set back five hundred years!