She was a young girl from the modern century who was reborn into a mysterious ancient country as a Heqin Princess (a princess meant for diplomatic marriage) and locked away in her quarters, fated to marry a prince. She thought she would have a blossoming romance as a reward for accumulating virtue in her past life. Little did she know that the handsome princes were only interested in her "wolf heart". The young girl soon discovers that she shares her body with another soul and that they are destined to face a world of humans with the hearts of beasts...