On the fantasy Bibo Island, humans and spiritual beasts have coexisted for thousands of years, but the fragile balance is being broken. Yun Yi, a young man who can communicate with fantasy beasts, awakened the rare talent of "Two-Hearted One" on the eve of his coming-of-age ceremony, but he was also involved in an ancient war. When a group of hostile phantom beasts attack the tribe, he must conclude a life-and-death contract with Moonlight Fox Xiaoye and embark on a dangerous journey to find the lost "Island Covenant". Faced with the threat of giant beasts in the deep sea and the life-or-death decision of the tribe, can Yun Yi uncover the true mission of the Two-Hearted Man and save Bibo Island from the brink of destruction?
