Elder Xia was a generation after generation "Demon Slayer". He firmly believed that humans and demons could coexist peacefully. He had two female disciples: his granddaughter Xia Bing and the adopted Xiao Wei. Unfortunately, Xiao Wei fell in love with a hypocrite who was already married. Unable to accept the shock of being deceived, her demonic nature was triggered instantly. Elder Xia, however, thought that Xiao Wei had not gotten rid of her demonic nature and they got into a conflict. Xiao Wei accidentally killed Elder Xia! Xia Bing vowed to find Xiao Wei for revenge. Xiao Wei, due to the return of her demonic nature...