Why is the crane boy in hell?

According to most ancient myths and legends in China, the crane boy is not in the underworld. He is a mythical figure in the novel Romance of Gods in the Ming Dynasty. He was a disciple of the immortal Antarctic immortal Weng, a fairy boy, a disciple of the Buddha in the early Yuan Dynasty, and was favored by the Buddha in the early Yuan Dynasty. He is the big brother of Xu Yu's three generations of disciples, and he is really a white crane (crane, red-crowned crane). He once helped cut Zhou. Hell is the underworld in China folklore, where the dead live and exists in parallel with the real world. Therefore, the crane boy is not in the underworld.