Sky Shadow.

Summary

A Tu, once a wild dog, is taken in by 6 Chen and Yi Xin, but he forms a strong bond with 6 Chen, causing Yi Xin heartbreak. After a war awakens A Tu's ancient bloodline, he transforms into a powerful black wolf demon. When A Tu encounters a giant wolf demon, he feels a connection and howls, prompting the giant wolf to gently acknowledge him as its offspring. 6 Chen realizes A Tu may be a descendant of the legendary Snow Wolf, the Tianlang. The Tianlang offers to spare 6 Chen's life and invites A Tu to stay and learn from it, but A Tu chooses to remain with 6 Chen. The Tianlang, impressed yet resigned, agrees to help them navigate the dangers of the Snow Mountain in exchange for a favor involving a person named "Tie Hu."

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