The Yuling clan set up a barrier to protect humans. Suddenly one day the barrier was broken, the Spirit clan was destroyed, and only Caiwei was rescued. Seven years later, Caiwei, who had become stronger, returned to her homeland, determined to avenge the fox demon. After meeting the young fox demon Yun Jin, she discovered that there was something hidden about what happened back then, so they went to the unknown demon realm to explore the truth. After many hardships, the mystery of the year was finally solved, but at the same time, a more powerful enemy was quietly approaching.