The Sun in the Dark Episode 15

Bai Yi Xi disguises herself as a schoolteacher, and Wan Gu Chen becomes her student. The two gradually develop feelings for each other both inside and outside the classroom. Wan Gu Chen deliberately arrives late and leaves early just to spend more time with Bai Yi Xi. Although Bai Yi Xi feels that, as a prince, he lacks understanding of the trivialities of daily life, she is also moved by his sincerity. However, Bai Yi Xi is arrested and imprisoned for offending the prince. Wan Gu Chen attempts to rescue her but, as a member of the Immortal Sect, is forbidden from intervening in mortal affairs. Bai Yi Xi watches helplessly as her student is brutally murdered, her heart filled with grief. After being rescued, her malevolent energy erupts, and she storms into the imperial palace and kills the emperor. Upon regaining her senses, she asks Wan Gu Chen to kill her to end it all. Wan Gu Chen was overcome with anguish, and Bai Yi Xi resolutely took her own life. In their fifth life, Bai Yi Xi was reincarnated as a rabbit spirit, and Wan Gu Chen protected her from harm. The two accidentally entered a world within a sword, where Bai Yi Xi witnessed their past and present lives and finally understood the reasons behind it all. (Source: Chinese = zuiai.tv || Translation = Deepl)