The Sun in the Dark Episode 12

300 years later, Bai Yi Xi was reborn as a witch who committed acts of violence everywhere she went to feed on malevolent energy. Wan Gu Chen found her and tried to stop her killing spree, but Bai Yi Xi accused him, saying that if he had stayed with her, she wouldn’t have killed anyone. Bai Yi Xi deliberately teased Wan Gu Chen; though his heart fluttered, he forced himself to remain in control, unwilling to harm her. Because of her indiscriminate killing of innocents, Bai Yi Xi was left with a scar on her face, rendering her unable to absorb vital energy anymore. Wan Gu Chen appeared to save her and transferred his own vital energy to her, warning her never to feed on others again. Bai Yi Xi gradually grew dependent on Wan Gu Chen, but after recovering, she discovered he had quietly left. She searched everywhere for him; upon learning this, Wan Gu Chen rushed to stop her but was unable to get close due to hostility from members of her sect. Bai Yi Xi decided to extract the demonic bone. Wan Gu Chen tried to stop her but could only watch helplessly as she was injured. (Source: Chinese = zuiai.tv || Translation = Deepl)