Paranormal Investigation Bureau Chronicles: Final Season Series (Complete 7 Volumes).

Summary

In the narrative, Sun Pang Zi encounters a peculiar copper lock without a keyhole, prompting a discussion with Yang Xiao and Shang Shan Lao He Shang about its historical significance. Yang Xiao reveals it as a rare Seven Openings Lock, crafted during the Qin and Han periods, known for securing valuable artifacts. Despite the initial struggle, the protagonist successfully unlocks it using inner power after much effort, demonstrating determination. Shang Shan Lao He Shang suggests that the lock has protective qualities and offers to help the protagonist grow their abilities through daily challenges, leading to a demanding routine of unlocking it multiple times a day, causing physical strain.

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