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

Summary

A white-haired man, Guang Ren, enters a cave where the protagonist is attacked by two male corpses. Despite his struggles, he is pinned down until Guang Ren intervenes, demonstrating his superior strength against the corpses, which are revealed to be mechanized. Guang Ren explains their vulnerabilities and hands the protagonist the Sin Sword. The protagonist initially fails to defeat a corpse but eventually discovers the main control switch in its armor. After thrusting the sword into it, the corpse collapses, indicating a successful kill. Guang Ren's guidance and the protagonist's eventual success highlight the struggle against seemingly invincible foes.

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