Civil Investigation Bureau: Strange Tales - Sequel.

Summary

A powerful and mysterious group consisting of a white-haired young man, an old man, and a young child encountered a clan at Wolf Sealing Mountain. After defeating clan members and their chief, they faced an ancient beast accidentally released from its seal. The white-haired young man easily subdued the beast but could not permanently destroy it. He offered the clan two choices: abandon their land or seal themselves to contain the beast until he returns with an artifact to slay it. The clan agreed, unknowingly committing themselves to an 800-year imprisonment, transforming into neither human nor spirit, waiting for their potential rescue.

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