Cui Xiaoxiao accidentally slips into a distorted world two hundred years in the past and crosses paths with Wei Jie, a troubled youth destined to fall into darkness. Mistakenly taking on his cursed fate, she becomes branded a demon while searching for a way home. As their bond deepens, Wei Jie’s real identity as a fallen ancient emperor is revealed. Together, they uncover the plot behind his downfall and fight side by side to protect the world from a looming threat.