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According to ancient lore, if a human freely offers their heart to a demon, that monster can become mortal, experiencing the true pains and passions of existence. This is the ultimate triumph of the underworld. Xiaowei (Xun Zhou, THE GREAT MAGICIAN, FLYING SWORDS OF DRAGON GATE), a millennia-old fox spirit, is freed from her frozen prison and transforms into a dangerous seductress, consuming living hearts to keep her beautiful as she searches for her chance to become human. Meanwhile, Princess Jing (Wei Zhao, 14 BLADES, RED CLIFF, SHAOLIN SOCCER), hiding her marred beauty behind a golden mask, flees an unknown threat to her kingdom by pursuing the only man she ever loved: The guard who was unable to protect her, so many years ago. A twist of fate brings Princess Jing and Xiaowei together, and a slow game of wits, deceit, and seduction begins for the princess very own heart.