Mo Xuanyu is a character from the popular Chinese web novel Mo Dao Zu Shi, also known as Grandmaster of Demonic Cultivation. He is introduced as a young man who, after suffering a tragic fate, uses a forbidden technique to resurrect himself. This act allows him to seek revenge on those who wronged him in his previous life. In his new life, Mo Xuanyu possesses the memories and abilities of his former self, which significantly influences his actions and relationships. He becomes entangled with other key characters, including Wei Wuxian, the protagonist, leading to complex interactions and developments throughout the story.