In her previous life, she was the queen of the underworld. After her tragic death, she traveled to another world and was accepted as a disciple by a "fallen demon" martial arts genius. She has an amazing talent. She took charge of the demon sect and wiped out the world with blood. However, due to her inner demons, she lost control and became a killing spree.
When the imperial army was encircling and suppressing her, the master who had made her a devil risked his life to defeat her and took her to retreat from the world.
Many years later, it was rumored that there was a mysterious man and woman in the hidden city - the woman was dressed in white and masked, and the man had an awe-inspiring sword. No one knew that they were the former number one devil in the world, and the man who fought against the whole world for her.