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According to what Liu Ming knew, in order to prevent the incursion of ghostly qi into one's body, all disciples who entered the Ghostly Path had to sign a certain contract and be branded with a mark. However, due to this contract, any cultivator who entered the Ghostly Path had to stay for at least ten years before they could leave freely.
Such a long time, coupled with the strength of the various ghostly creatures in the Ghostly Path not being inferior to disciples of the four Great Sects, and even with powerful ghosts of celestial phenomena level and above stationing there, meant that after entering, it was possible for one to have a drastic increase in strength through life-and-death struggles and various opportunities, even breaking through bottlenecks. But the greater likelihood is to be buried there forever, never to leave again.