Ten years ago, the war between the sun and moon butterfly demon tribes began. In the chaos, the sun butterfly king Qian Bing and the moon butterfly wizard Ning Guang fell in love with each other at first sight, and they married and gave birth to a half-blood butterfly demon girl, Xue Ji. That war destroyed the Yue clan, severely damaged the Japanese clan, and also destroyed the parents of the newborn girl. However, she miraculously survived the nine-year war and lived in the human world, hiding her identity and becoming a poor match girl. Unexpectedly, there is a huge secret buried in her body...