The heroine, Yun Xien, is a pretty girl from an ordinary family with ordinary grades. At university, she earned her first fortune through livestreaming and met Duan Jingyu, a rich second-generation heir. Handsome and wealthy, he started his own business with his family's support.
The two fell deeply in love, but they never expected Duan Jingyu's childhood sweetheart, Zhong Yi, to return from abroad. She was a perfect match for Duan Jingyu and the one he had never been able to forget, his unattainable first love. Duan Jingyu grew increasingly distant, and only after making inquiries in every direction did Xien learn about Zhong Yi.
Yun Xien secretly sought Zhong Yi out and discovered that the girl was both stunning and wealthy. What hurt Xien even more was realizing that this kind, beautiful girl looked just like her. She had been nothing but Zhong Yi's substitute all along.
Unable to accept the failure of her relationship, Yun Xien sank deeper into despair and began making frequent mistakes during her livestreams. Before long, her career began to decline as well. Crushed by the double blow to her career and love life, Yun Xien fell into a terrible mental state. Finally, after learning that her ex-boyfriend Duan Jingyu and Zhong Yi were engaged, she gave in to despair and slit her wrists in front of the full-length mirror in her bedroom.
Luckily, Xien's good friend Hao Li found her in time. Xien was rushed to the hospital and successfully resuscitated. But something even stranger began happening to her.
At first, Yun Xien merely found that she couldn't see herself clearly in the mirror. Then she saw a strange woman in the mirror who looked exactly like her. The figure in the mirror tempted Yun Xien to exchange souls with it, promising to help her fulfill every wish. Lonely and helpless, Yun Xien couldn't resist the temptation. She eventually made a pact with the figure in the mirror and became a mirror demon wandering the city.
