Many people cannot understand why Princess Song Mingzhen of Yu Jing, sent from the Li Kingdom to marry into the Jin Kingdom, is still pursued by so many of its princes. After all, her most notorious trait is that she brings death to her husbands. Everyone knows she has already caused the deaths of two fiancés, yet she insists she has had three, as if having one more somehow gives her an advantage. Since she has come here for a political marriage, she must choose a prince. The Crown Prince, Prince Chu, and Prince Liang each have their own power and schemes. But she sets her sights on an overlooked prince, solely because his phoenix eyes are identical to those of someone she met as a child. Kindness? Love? Song Mingzhen has nothing left but the ambition to control the Jin Kingdom. Seeking victory through betrayal and a way to survive through slaughter, she admits it: she is a demon. So when she meets Si Yue, is it a demon defiling a deity, or a deity redeeming a demon?