After playing the villain, he spent decades searching for his sister and finally found her. But his sister had been severely injured by greedy mortals who stole her cultivation, leaving her soul incomplete and her spiritual body locked at the bottom of the ice lake for many years.
Later, to save his sister and mend her soul, the villain willingly turned to the dark side, using extremely cruel methods to kill countless innocents.
Towards the end of the script, the villain successfully saved his sister. However, he faced heavenly punishment himself. In the end, Jane Sampson, the very role she sought, used a forbidden family technique to secretly swap her life card with her brother's, taking the heavenly punishment for him, and then disappeared into the six realms.